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In mathematics (and more specifically geometry), a semicircle is a one-dimensional locus of points that forms half of a circle. It is a circular arc that measures 180° (equivalently, π radians, or a half-turn). It only has one line of symmetry (reflection symmetry).
Many shapes have metaphorical names, i.e., their names are metaphors: these shapes are named after a most common object that has it. For example, "U-shape" is a shape that resembles the letter U , a bell-shaped curve has the shape of the vertical cross section of a bell , etc.
This is a list of two-dimensional geometric shapes in Euclidean and other geometries. For mathematical objects in more dimensions, see list of mathematical shapes. For a broader scope, see list of shapes.
picture dec picture dec picture circle with left half black upper half circle white square with upper left quadrant 0 ◐ ◠ ◰ ◐ ◠ ◰ circle with right half black lower half circle white square with lower left quadrant 1 ◑ ◡ ◱ ◑ ◡ ◱ circle with lower half black black ...
The use of Scalable Vector Graphics to render Harvey balls allows them to be easily used in web browsers and applications that support the XML vector graphics format. The benefit is that no special font is required and the Harvey balls can be displayed using an open format. The main drawback is that SVG is not universally supported.
A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
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A quatrefoil (anciently caterfoil) [1] is a decorative element consisting of a symmetrical shape which forms the overall outline of four partially overlapping circles of the same diameter. It is found in art, architecture, heraldry and traditional Christian symbolism . [ 2 ]