polyiamond

Etymology
, the polyiamond made up of two triangles being a diamond or rhombus.

Noun

 * 1)  A polyform made by joining one or more equilateral triangles edge to edge in various arrangements. Every polyiamond corresponds to a polyhex,

Synonyms

 * n-iamond

Derived terms


Some authors also call the diamond (rhombus with a 60° angle) a calisson after the French sweet of similar shape.