is a counterpart to a polyomino
where the polygon
used for tiling
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.