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An octahedron is a polyhedron which has $8$ faces.

Regular Octahedron

A regular octahedron is an octahedron whose $8$ faces are all congruent equilateral triangles.

Also see

  • Results about octahedra can be found here.

Linguistic Note

The word octahedron derives from the Classical Greek:

octo (ὀκτώ), meaning eight
hedron (a form of ἕδρα), meaning base or seat.

The technically correct plural of octahedron is octahedra, but the word octahedrons can often be found.