An arrangement in a plane of n equilateral triangles joined to one another by at least one of their sides.

The order of a polyiamond corresponds to the number of triangles assembled in a configuration.

Polyiamond of order 3 or triamond

Naming polyiamonds

  • Order of 1 (one triangle): moniamond
  • Order of 2 (2 triangles): diamond
  • Order of 3 (3 triangles): triamond
  • Order of 4 (4 triangles): tetriamond
  • Order of 5 (5 triangles): pentiamond
  • Order of 6 (6 triangles): hexiamond
  • Etc.

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