A tetrahedral die (not dice!) is a triangle-based pyramid, whose four faces are equilateral triangles.
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Some roleplaying game die and puzzles such as the Rubik's Cube are shaped like tetrahedrons.
Sugar lumps, dice...
SIX sides
A rubick's cube, an icecube, dice, baby block, some boxes, 2x2 Lego pieces
A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.