# Square (disambiguation)

From Citizendium, the Citizens' Compendium

*This disambiguation page lists articles associated with the same or a similar title.*

- In elementary geometry [r]: A regular polygon of four sides.
^{[e]} - In mathematics generally [r]:
*Add brief definition or description* - Squaring the circle [r]:
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- Square circle [r]: A plane shape, or object viewed from one side, that is both a square and a circle; in philosophy, a common example of an impossible object.
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- In cryptology [r]: A block cipher invented by Joan Daemen and Vincent Rijmen, and a forerunner to the Rijndael algorithm, which has been adopted as the Advanced Encryption Standard.
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- Square of opposition [r]: A diagram representing the different ways in which each of the four propositions of the system are logically related ('opposed') to each of the others.
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