In geometry, flexagons are flat models, usually constructed by folding strips of paper, that can be flexed or folded in certain ways to reveal faces besides the two that were originally on the back and front. Flexagons are usually square or rectangular (tetraflexagons) or hexagonal (hexaflexagons). A prefix can be added to the name to indicate the...
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http://en.wikipedia.org/wiki/Flexagon
(from the article `number game`) A flexagon is a polygon constructed from a strip of paper or thin metal foil in such a way that the figure possesses the property of changing its ...
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http://www.britannica.com/eb/a-z/f/36
A flat model constructed from a folded strip of paper, which, when flexed, can be made to reveal a number of hidden faces. Flexagons are amusing toys but they have also caught the interest of mathematicians. They are usually square or rectangular (tetraflexagons) or hexagonal (hexaflexagons). A pref...
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http://www.daviddarling.info/encyclopedia/F/flexagon.html
a three-dimensional figure having polygonal faces that is constructed from a folded sheet of paper in such a way that different faces are exposed when the figure is flexed along its folds.
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https://www.infoplease.com/dictionary/flexagon
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