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A deltahedron is a polyhedron each of whose faces are equilateral triangles.

Also see

  • Results about deltahedra can be found here.

Linguistic Note

The word deltahedron derives ultimately from Classical Greek:

delta, the Greek letter $\Delta$, which is traditionally triangular in shape
hedron (a form of ἕδρα), meaning base or seat.

The technically correct plural of deltahedron is deltahedra, but the word deltahedrons can often be found.