Yes trapezoid
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There are lots of shapes; some examples:the letter Sthe letter Nthe letter Z
H, I, O, S, X, Z. l as for the shapes circle, square, rectangle, equilateral triangle, any regular polygon (pentagon, hexagon...)
an integer can be represented as any letter of the alphabet
An integer can be denotated by any letter. Teachers/professors may use different letters as a means to represent on a graph (i.e. x,y,z axis), but there is usually no real meaning behind why the letter 'z' was chosen over 'q'.
Any letter in the alphabet can be used to represent a variable in algebra.