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Function whose graph is 0, then 1, then 0 again, in an almost-everywhere continuous way
The rectangular function (also known as the rectangle function, rect function, Pi function, Heaviside Pi function, gate function, unit pulse, or the normalized
Rectangular_function
Uniform distribution on an interval
probability theory and statistics, the continuous uniform distributions or rectangular distributions are a family of symmetric probability distributions. Such
Continuous uniform distribution
Continuous_uniform_distribution
Function used in signal processing
diffraction from rectangular vs. circular apertures, which can be visualized in terms of the product of two sinc functions vs. an Airy function, respectively
Window_function
Special mathematical function defined as sin(x)/x
everywhere and hence an entire function. The normalized sinc function is the Fourier transform of the rectangular function with no scaling. It is used in
Sinc_function
Linear combination of indicator functions of real intervals
system. The rectangular function, the normalized boxcar function, is used to model a unit pulse. The integer part function is not a step function according
Step_function
Indicator function of positive numbers
brackets Negative number Rectangular function Sign function Sine integral Step response Weisstein, Eric W. "Heaviside Step Function". MathWorld. Bracewell
Heaviside_step_function
Tent function, often used in signal processing
Equivalently, it may be defined as the convolution of two identical unit rectangular functions: tri ( x ) = rect ( x ) ∗ rect ( x ) = ∫ − ∞ ∞ rect ( x
Triangular_function
Loss function used in robust regression
The Huber loss is the convolution of the absolute value function with the rectangular function, scaled and translated. Thus it "smoothens out" the former's
Huber_loss
Generalized function whose value is zero everywhere except at zero
\left[-{\frac {1}{2}},{\frac {1}{2}}\right]} , also known as the rectangular function, then: η ε ( x ) = 1 ε rect ( x ε ) = { 1 ε , − ε 2 < x < ε 2
Dirac_delta_function
Ideal low-pass filter or averaging filter
response is a sinc function and whose frequency response is rectangular, or to a sinc-in-frequency filter whose impulse response is rectangular and whose frequency
Sinc_filter
The integral of the Dirac delta function. Sawtooth wave Square wave Triangle wave Rectangular function Floor function: Largest integer less than or equal
List of mathematical functions
List_of_mathematical_functions
Form of error in digital signals; spurious signals near sharp transitions
domain by a rectangular function causes ripples in the frequency domain for the same reason as a brick-wall low pass filter (rectangular function in the frequency
Ringing_artifacts
Mathematical transform that expresses a function of time as a function of frequency
For example, the Fourier transform of the rectangular function, which is integrable, is the sinc function, which is not Lebesgue integrable, because
Fourier_transform
Type of non-sinusoidal waveform
can also be defined with respect to the Heaviside step function u(t) or the rectangular function Π(t): x ( t ) = 2 [ ∑ n = − ∞ ∞ Π ( 2 ( t − n T ) T −
Square_wave_(waveform)
Type of signal filter
a signal by the rectangular function in the frequency domain or, equivalently, convolution with its impulse response, a sinc function, in the time domain
Low-pass_filter
Function returning minus 1, zero or plus 1
Heaviside step function Negative number Rectangular function Sigmoid function (Hard sigmoid) Step function (Piecewise constant function) Three-way comparison
Sign_function
Mathematical function resembling a boxcar
low-pass filter. Boxcar averager Rectangular function Step function Top-hat filter Weisstein, Eric W. "Boxcar Function". MathWorld. Retrieved 13 September
Boxcar_function
Topics referred to by the same term
{\displaystyle \Pi (x)\,\!} (Pi function) – the gamma function when offset to coincide with the factorial Rectangular function π ( n ) {\displaystyle \pi (n)\
Pi_function
Periodic rectangular waveform
A pulse wave, pulse train, or rectangular wave is a sequence of discrete pulses occurring in a signal over time. Typically, these pulses are of similar
Pulse_wave
Sufficiency theorem for reconstructing signals from samples
and delayed sinc functions, nor ideal Dirac pulses. Instead they produce a piecewise-constant sequence of scaled and delayed rectangular pulses (the zero-order
Nyquist–Shannon sampling theorem
Nyquist–Shannon_sampling_theorem
Model of signal reconstruction in digital-to-analog (DAC) converters
c t ( ⋅ ) {\displaystyle \mathrm {rect} (\cdot )} is the rectangular function. The function r e c t ( t − T / 2 T ) {\displaystyle \mathrm {rect} \left({\frac
Zero-order_hold
Pulse-shaping filter in digital modulation
rect ( ⋅ ) {\displaystyle \operatorname {rect} (\cdot )} is the rectangular function, so the impulse response approaches h ( t ) = 1 T sinc ( t T )
Raised-cosine_filter
Variant Fourier transforms
functions into a sum of sine waves representing the odd component of the function plus cosine waves representing the even component of the function.
Sine_and_cosine_transforms
Mathematical description of quantum state
In quantum mechanics, a wave function (or wavefunction) is a mathematical description of the quantum state of an isolated quantum system. The most common
Wave_function
Mathematical description in crystallography
{\displaystyle \ast } [basis] × {\displaystyle \times } rectangular function, where the rectangular function has a value 1 inside the crystal and 0 outside it
Structure_factor
Type of matrix barcode
Rectangular Micro QR Code (also known as rMQR Code) is two-dimensional (2D) matrix barcode invented and standardized in 2022 by Denso Wave as ISO/IEC
Rectangular_Micro_QR_Code
Part of signal processing in time-frequency analysis
x(t)={\begin{cases}1&|t|<1/2\\0&{\text{otherwise}}\end{cases}}\qquad } , the rectangular function ⇒ W x ( t , f ) = { 1 π f sin ( 2 π f { 1 − 2 | t | } ) | t | <
Wigner_distribution_function
Effect in signal processing
applied to the product of the waveform and a window function. Any window (including rectangular) affects the spectral estimate computed by this method
Spectral_leakage
Signal (re-)construction algorithm
Anti-aliasing filter, Spatial anti-aliasing Rectangular function Sampling (signal processing) Signal (electronics) Sinc function, Sinc filter Lanczos resampling
Whittaker–Shannon interpolation formula
Whittaker–Shannon_interpolation_formula
Branch of mathematics studying functions of a complex variable
traditionally known as the theory of functions of a complex variable, is the branch of mathematical analysis that investigates functions of a complex variable of
Complex_analysis
Complex-differentiable (mathematical) function
In mathematics, a holomorphic function is a complex-valued function of one or more complex variables that is complex differentiable in a neighbourhood
Holomorphic_function
Function that applies a set to itself
In mathematics, a transformation, transform, or self-map is a function f, usually with some geometrical underpinning, that maps a set X to itself, i.e
Transformation_(function)
Extension of the factorial function
gamma function (represented by Γ {\displaystyle \Gamma } , capital Greek letter gamma) is the most common extension of the factorial function to complex
Gamma_function
Mathematical function
In mathematics, a Gaussian function, often simply referred to as a Gaussian, is a function of the base form f ( x ) = exp ( − x 2 ) {\displaystyle f(x)=\exp(-x^{2})}
Gaussian_function
Representation of a mathematical function
variable is plotted as a function of another, typically using rectangular axes; see Plot (graphics) for details. A graph of a function is a special case of
Graph_of_a_function
Quick, temporary change in amplitude of electrical signals
These can be found in pulse waves, square waves, boxcar functions, and rectangular functions. In digital signals the up and down transitions between high
Pulse_(signal_processing)
Concept in statistics
if the mixture parameter is θ, then the beta rectangular distribution has probability density function[citation needed] p ( x | α , β , θ ) = { θ Γ (
Beta_rectangular_distribution
Signal filtering technique
introducing a shift in the output function. Boxcar averager Rectangular function Step function Boxcar function Broughton, S. A.; Bryan, K. (2008). Discrete Fourier
Top-hat_filter
Technique for creating virtual acoustic environments
the spatial domain and is caused by application of a rectangular function as a window function on what would otherwise be an infinite array of speakers
Wave_field_synthesis
Theorem concerning transmission lines
squares is not just limited to step functions. It also applies to an impulse response or a rectangular function which are more relevant to telegraphy
Law_of_squares
Signal processing technique
and carrier frequency, f 0 {\displaystyle f_{0}} , truncated by a rectangular function of width, T {\displaystyle T} . The pulse is transmitted periodically
Pulse_compression
Aspect of mathematical spectrum theory
, then we can construct ψ n {\displaystyle \psi _{n}} to be the rectangular function on [ 2 − n , 2 − n + 1 ] {\displaystyle [2^{-n},2^{-n+1}]} of height
Essential_spectrum
Mathematical function used in signal processing
function is named after the Austrian meteorologist Julius von Hann. It is a window function used to perform Hann smoothing or hanning. The function,
Hann_function
Analytic function that does not satisfy a polynomial equation
Infinite. These ancient transcendental functions became known as continuous functions through quadrature of the rectangular hyperbola xy = 1 by Grégoire de Saint-Vincent
Transcendental_function
Filters used in signal processing that are optimal in some sense
time length of one bit and Π ( x ) {\displaystyle \Pi (x)} is the rectangular function. Thus, the signal to be sent by the transmitter is If we model our
Matched_filter
can vary in shape from a rectangular function (p = 0), to a semi-ellipse (p = 1/2), to a parabola (p = 1), to a pulse function (p > 1). Without loss of
Superparabola
Model in digital signal processing
\mathrm {rect} (x)\ } is the rectangular function and t r i ( x ) {\displaystyle \mathrm {tri} (x)\ } is the triangular function. The effective frequency
First-order_hold
Rectangular, enlarged or extended dolmen
and function are a hallmark of social development. Whilst the simple dolmen as a rule only had one capstone (but could have two), the rectangular dolmen
Rectangular_dolmen
Approach used in computer vision systems
has been determined empirically. This function has the appearance of a smoothed top-hat or rectangular function. The area of the SUSAN is given by: n
Corner_detection
Type of function in mathematics
Weisstein, Eric W. "Analytic Function". MathWorld. Solver for all zeros of a complex analytic function that lie within a rectangular region by Ivan B. Ivanov
Analytic_function
Constants of the mathematical zeta function
zeros. The Riemann zeta function article includes a colour plot illustrating how the function varies over a continuous rectangular region of the complex
Particular values of the Riemann zeta function
Particular_values_of_the_Riemann_zeta_function
Mathematical function that preserves angles
In mathematics, a conformal map is a function that locally preserves angles, but not necessarily lengths. More formally, let U {\displaystyle U} and V
Conformal_map
Imaging Instrument
three parts of the wave function and their derivatives at z = 0 and z = w (detailed derivation is in the article Rectangular potential barrier). This
Scanning_tunneling_microscope
Plane curve: conic section
equation y = 1 / x {\displaystyle y=1/x} is a rectangular hyperbola. Using the hyperbolic sine and cosine functions cosh , sinh {\displaystyle \cosh ,\sinh
Hyperbola
Small protrusion on a dendrite that receives input from a single axon
discrete fashion with the wave form conventionally represented as a rectangular function. Calcium transients in spines are a key trigger for synaptic plasticity
Dendritic_spine
Branch of mathematics
of the function near that point. By finding the derivative of a function at every point in its domain, it is possible to produce a new function, called
Calculus
Visualisation method for hierchical data
[example needed] To date, fifteen primary rectangular treemap algorithms have been developed: Rectangular treemaps have the disadvantage that their aspect
Treemapping
Mathematical function, inverse of an exponential function
prosthaphaeresis. Invention of the function now known as the natural logarithm began as an attempt to perform a quadrature of a rectangular hyperbola by Grégoire de
Logarithm
Mathematical function
In mathematics, the trigamma function, denoted ψ1(z) or ψ(1)(z), is the second of the polygamma functions, and is defined by ψ 1 ( z ) = d 2 d z 2 ln
Trigamma_function
Matrix of partial derivatives of a vector-valued function
calculus, the Jacobian matrix (/dʒəˈkoʊbiən/, /dʒɪ-, jɪ-/) of a vector-valued function of several variables is the matrix of all its first-order partial derivatives
Jacobian matrix and determinant
Jacobian_matrix_and_determinant
Stadium in Vincent, Western Australia
Perth Rectangular Stadium (also known as HBF Park under naming rights) is a sports stadium in Perth, the capital of the Australian state of Western Australia
Perth_Rectangular_Stadium
Measure used in psychoacoustics
or ERB-number scale, can be defined as a function ERBS(f) which returns the number of equivalent rectangular bandwidths below the given frequency f. The
Equivalent rectangular bandwidth
Equivalent_rectangular_bandwidth
Area, where a potential exhibits a local maximum
In quantum mechanics, the rectangular (or, at times, square) potential barrier is a standard one-dimensional problem that demonstrates the phenomena of
Rectangular_potential_barrier
w(t) is a window function. When the w(t) is a rectangular function, the transform is called Rec-STFT. When the w(t) is a Gaussian function, the transform
Time–frequency analysis for music signals
Time–frequency_analysis_for_music_signals
Special mathematical functions defined on the surface of a sphere
problems in rectangular domains, such as the solution of the heat equation and wave equation. This could be achieved by expansion of functions in series
Spherical_harmonics
Largest and smallest value taken by a function at a given point
analysis, the maximum and minimum of a function are, respectively, the greatest and least value taken by the function. Known generically as extrema, they
Maximum_and_minimum
Coordinate system using perpendicular axes
coordinate. A Cartesian coordinate system in two dimensions (also called a rectangular coordinate system or a Cartesian orthogonal coordinate system) is defined
Cartesian_coordinate_system
Logarithm to the base of the mathematical constant e
The natural logarithm can be defined as the area under the graph of a rectangular hyperbola with equation y = 1 / x {\displaystyle y=1/x} between x = 1
Natural_logarithm
Frequency of a chirp pulse
Gaussian function then a T.ΔF product as low as 15 will give acceptable results, but if both a(t) and |S(ω)| are defined by rectangular functions, then the
Chirp_spectrum
Number which when multiplied by x equals 1
reciprocal function, the function f(x) that maps x to 1 x , {\displaystyle {\tfrac {1}{x}},} is one of the simplest examples of a function which is its
Multiplicative_inverse
Lingerie accessories
angle to bra cup. A ring can be in any shape, for example circular, rectangular, triangular or even heart and flower shaped. A slide has its crossbar
Ring,_slide_and_hook
Decomposition of periodic functions
periodic function into a sum of trigonometric functions. The Fourier series is an example of a trigonometric series. By expressing a function as a sum
Fourier_series
Region of the Cartesian plane bounded by a hyperbola and two radii
origin to it. For example, the two points (a, 1/a) and (b, 1/b) on the rectangular hyperbola xy = 1, or the corresponding region when this hyperbola is
Hyperbolic_sector
Mathematical technique
is a technique that transforms a function defined on the surface of the sphere to a function defined on a rectangular domain while preserving periodicity
Double_Fourier_sphere_method
Operation in mathematical calculus
also refer to the concept of an antiderivative, a function whose derivative is the given function; in this case, they are also called indefinite integrals
Integral
Hydraulic jump in a rectangular channel, also known as classical jump, is a natural phenomenon that occurs whenever flow changes from supercritical to
Hydraulic jumps in rectangular channels
Hydraulic_jumps_in_rectangular_channels
Cellular automaton
cellular automaton originally defined on an N × M {\displaystyle N\times M} rectangular grid (checkerboard) Γ ⊂ Z 2 {\displaystyle \Gamma \subset \mathbb {Z}
Abelian_sandpile_model
Output as a function of input frequency
the quantitative measure of the magnitude and phase of the output as a function of input frequency. The frequency response is widely used in the design
Frequency_response
Species of fish
The reef triggerfish (Rhinecanthus rectangulus), also known as the rectangular triggerfish, wedgetail triggerfish or by its Hawaiian name humuhumunukunukuāpuaʻa
Reef_triggerfish
Country in South Asia
shawl and phanek—lower-body garment similar to a sarong, and made of a rectangular piece of cloth with one pair of opposite sides stitched together Women
India
Special function occurring in problems possessing elliptic symmetry
In mathematics, Mathieu functions, sometimes called angular Mathieu functions, are solutions of Mathieu's differential equation d 2 y d x 2 + ( a − 2
Mathieu_function
Method of multivariate interpolation on a 3-dimensional regular grid
of a function at an intermediate point ( x , y , z ) {\displaystyle (x,y,z)} within the local axial rectangular prism linearly, using function data on
Trilinear_interpolation
Functions for thermal radiation in hot enclosures
radiation field in a thin layer of gas between two parallel rectangular plates). These functions have practical applications in several engineering problems
Bickley–Naylor_functions
Numerical method for solving physical or engineering problems
in a system of algebraic equations. The method approximates the unknown function over the domain. The simple equations that model these finite elements
Finite_element_method
Equation in electrochemistry
that is planar but can also be derived for spherical, cylindrical, and rectangular geometries by using the corresponding Laplace operator and boundary conditions
Cottrell_equation
Second-order partial differential equation
analyzing the behavior of harmonic functions at infinity. Laplace's equation in two independent variables in rectangular coordinates has the form ∂ 2 ψ ∂
Laplace's_equation
Physical structure guiding light waves
laser diodes are frequently constructed as rectangular optical waveguides. Optical waveguides with rectangular geometry are produced by a variety of means
Waveguide_(optics)
Integer having a non-trivial divisor
such numbers are 1 and 2). Composite numbers have also been called "rectangular numbers", but that name can also refer to the pronic numbers, numbers
Composite_number
Method of mathematical integration
of a non-negative function of a single variable can be regarded, in the simplest case, as the area between the graph of that function and the X axis. The
Lebesgue_integral
Type of polynomial
every "slice" of the domain along coordinate axes. When the domain is rectangular in the coordinate axes (e.g. a hypercube), f {\displaystyle f} will have
Multilinear_polynomial
Algorithmic runtime requirements for common math procedures
Borwein & Borwein. The elementary functions are constructed by composing arithmetic operations, the exponential function ( exp {\displaystyle \exp } ), the
Computational complexity of mathematical operations
Computational_complexity_of_mathematical_operations
Function for correlating hair cells with auditory neurons
The Greenwood function correlates the position of the hair cells in the inner ear to the frequencies that stimulate their corresponding auditory neurons
Greenwood_function
Device performing a Boolean function
A logic gate is a device that performs a Boolean function, a logical operation performed on one or more binary inputs that produces a single binary output
Logic_gate
Generating polynomial of the number of ways to place non-attacking rooks on a chessboard
the same row or column. The board is any subset of the squares of a rectangular board with m rows and n columns; we think of it as the squares in which
Rook_polynomial
Arctangent function with two arguments
scientific calculators, the function can often be calculated as the angle given when (x, y) is converted from rectangular coordinates to polar coordinates
Atan2
Capability of some programming languages
an overloaded function will run a specific implementation of that function appropriate to the context of the call, allowing one function call to perform
Function_overloading
Integral transform useful in probability theory, physics, and engineering
transform that converts a function of a real variable (usually t {\displaystyle t} , in the time domain) to a function of a complex variable s {\displaystyle
Laplace_transform
Social media platform owned by Meta
27, 2015). "Instagram finally drops square picture rules to embrace rectangular photos". The Daily Telegraph. Archived from the original on January 10
Historic architectural style native to Najd region, Saudi Arabia
mudbrick buildings that are characterized by elements such as triangular or rectangular openings (furjat) and battlements (shurfat) as well as peepholes projecting
Najdi_architecture
Microsoft Windows screenshot utility
later. It can take still screenshots or record videos of an open window, rectangular areas, a free-form area, or the entire screen. Snips can then be annotated
Snipping_Tool
RECTANGULAR FUNCTION
RECTANGULAR FUNCTION
Male
Egyptian
, an Egyptian functionary.
Male
Egyptian
, a great functionary.
Biblical
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Surname or Lastname
English
English : nickname from the animal, Middle English catte ‘cat’. The word is found in similar forms in most European languages from very early times (e.g. Gaelic cath, Slavic kotu). Domestic cats were unknown in Europe in classical times, when weasels fulfilled many of their functions, for example in hunting rodents. They seem to have come from Egypt, where they were regarded as sacred animals.English : from a medieval female personal name, a short form of Catherine.Variant spelling of German and Dutch Katt.
Surname or Lastname
English
English : topographic name for someone who lived by the gates of a medieval walled town. The Middle English singular gate is from the Old English plural, gatu, of geat ‘gate’ (see Yates). Since medieval gates were normally arranged in pairs, fastened in the center, the Old English plural came to function as a singular, and a new Middle English plural ending in -s was formed. In some cases the name may refer specifically to the Sussex place Eastergate (i.e. ‘eastern gate’), known also as Gates in the 13th and 14th centuries, when surnames were being acquired.Americanized spelling of German Götz (see Goetz).Translated form of French Barrière (see Barriere).In New England, Gates was the preferred English version of the name of an extensive French family, called Barrière dit Langevin.
Surname or Lastname
English
English : occupational name for a dresser of cloth, Old English fullere (from Latin fullo, with the addition of the English agent suffix). The Middle English successor of this word had also been reinforced by Old French fouleor, foleur, of similar origin. The work of the fuller was to scour and thicken the raw cloth by beating and trampling it in water. This surname is found mostly in southeast England and East Anglia. See also Tucker and Walker.In a few cases the name may be of German origin with the same form and meaning as 1 (from Latin fullare).Americanized version of French Fournier.Samuel Fuller (1589–1633), born in Redenhall, Norfolk, England, was among the Pilgrim Fathers who sailed on the Mayflower in 1620. He was a deacon of the church and until his death functioned as Plymouth Colony’s physician.
Boy/Male
Buddhist, Indian, Japanese
Mysterious Function
Male
Egyptian
, the son of the functionary Heknofre.
Male
Egyptian
, Functionary of the Interior.
Male
Egyptian
, a high Egyptian functionary.
Surname or Lastname
English
English : probably a habitational name from a lost or unidentified place, generally from a field name denoting a triangular area, Old English gÄra (see Gore) at the corner of an open field after rectangular furlongs had been laid out.Jewish : Americanized form of one or more like-sounding Jewish surnames.U.S. President James Abram Garfield (1831–81) was preceded by at least six Garfields born in America, his immigrant ancestor having come to Massachusetts Bay with John Winthrop in 1630.
Male
Celtic
, great justiciary, or functionary.
Male
Egyptian
, an Egyptian functionary.
Surname or Lastname
English (chiefly Kent and Sussex)
English (chiefly Kent and Sussex) : occupational name for a designer or engineer, from a Middle English reduced form of Old French engineor ‘contriver’ (a derivative of engaigne ‘cunning’, ‘ingenuity’, ‘stratagem’, ‘device’). Engineers in the Middle Ages were primarily designers and builders of military machines, although in peacetime they might turn their hands to architecture and other more pacific functions.German : from the Latin personal name Januarius (see January 1). Jänner is a South German word for ‘January’, and so it is possible that this is one of the surnames acquired from words denoting months of the year, for example by converts who had been baptized in that month, people who were born or baptized in that month, or people whose taxes were due in January.
RECTANGULAR FUNCTION
RECTANGULAR FUNCTION
Boy/Male
Muslim
Just, Noble king of iran
Girl/Female
Indian, Tamil
Goddess Amman
Girl/Female
Greek
Wise.
Boy/Male
Hindu, Indian
Luck
Male
English
Middle English form of Anglo-Saxon Eadric, EDRIC means "rich ruler."
Girl/Female
Indian
Of the mountain, Another name of Parvati
Girl/Female
Hebrew
Goodly.
Surname or Lastname
English, Scottish, or German
English, Scottish, or German : variant of Huskey.
Surname or Lastname
English (chiefly Sussex)
English (chiefly Sussex) : variant of Standen, or a habitational name from a place in Lancashire with the same etymology.
Girl/Female
Tamil
Charithriya | சரீதà¯à®°à¯€à®¯à®¾Â
History
RECTANGULAR FUNCTION
RECTANGULAR FUNCTION
RECTANGULAR FUNCTION
RECTANGULAR FUNCTION
RECTANGULAR FUNCTION
a.
Right-angled; having one or more angles of ninety degrees.
a.
Right-angled; rectangular; as, an orthogonal intersection of one curve with another.
a.
Rectangular.
n.
A drawplate with a narrow, rectangular orifice, for drawing flat strips, as watch springs, etc.
n.
A rectangular rent made in cloth; -- called also winkle-hole.
n.
A rectangular figure.
n.
Any oblong rectangular mass; as, a brick of maple sugar; a penny brick (of bread).
a.
Nearly or approximately pentangular; almost pentangular.
a.
Heptagonal.
n.
A rectangular iron frame in which pages or columns of type are imposed.
a.
Rectangular.
a.
Having ten angles.
a.
Containing or having two right angles; as, a birectangular spherical triangle.
n.
The quality or condition of being rectangular, or right-angled.
a.
Having seven angles.
a.
Having eight angles; eight-angled.
a.
Having greater length than breadth, esp. when rectangular.
n.
A solid of five sides, having a rectangular base, two rectangular or trapezoidal sides meeting in an edge, and two triangular ends.
n.
An oblong rectangular piece of cloth, worn by Roman ladies, and fastened with brooches.
a.
Having five corners or angles.