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Polyamonds
A polyamond is a counterpart to a polyomino where the polygon used for tiling the plane is an equilateral triangle rather than a square.
Like polyominoes, but unlike polyhexes[?], polyamonds have a three dimensional counterparts. These are formed by aggregating tetrahedra.
The word polyamond is a back-formation from the word diamond motivated by the fact that this word is often used to describe the shape of a pair of equilateral triangles placed base to base.
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