Square

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A square as a geometric shape is described and illustrated at square (geometry). There are other concepts derived from it:

the geometric unit square;
the square units of measurement, such as the square mile, square meter, square kilometer, square inch, and square megameter;
the square waveform.

But a square is also several other things, conceptually or etymologically derived from the shape:

an algebraic square,
- and the closely related square number
- and perfect square;
a city square;
the town of Central Square, New York;
the carpentry square, combination square and try square;
the drafting tool called the T-square;
A Square, the main narrator of the geometry story Flatland;
on the subject of video games, Square is short for Squaresoft;
square as a slang noun or adjective;
the Square cryptographic block cipher;
the various square dances;
the Mandarin square insignia;
the hawk species the Square-tailed Kite;
the sailing term, square-rigging.

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