One of the mysteries of the English language finally explained.
Originally: a strip of paper marked with equilateral triangles, alternately upright and inverted and each typically decorated with a pattern or colour, which can be folded into the shape of a regular hexagon in a number of different ways; a hexagon made in this way, which can be manipulated to display different faces in different combinations. In later use also: any regular polygon made in this way.
1950s; earliest use found in Mathematical Gazette. Blend of flex and hexagon.
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