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In geometry, flexagons are flat models usually constructed by folding strips of paper that can flexed or folded in a certain way, to reveal faces besides the two that were originally on the back and front.
Flexagons are usually square or rectangular (tetraflexagons) or hexagonal (hexaflexagons), but can be a wide variety of shapes. Two prefixes are usually added to denote a specific flexagon: the first prefix is the number of faces it has (including the front and back), and the second is the number of sides each face has. If only one prefix is used, it refers to a class of flexagons with the same number of sides each face has, denoted by that prefix. For example, a trihexaflexagon is a flexagon with three faces, each with six sides.