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The triangular (or trigonal) dipyramid is one of the convex deltahedra, and Johnson solid 
. It is also an isohedron.
It is implemented in the Wolfram Language as PolyhedronData[
"Dipyramid", 3
].
See also
Deltahedron, Dipyramid, Hexahedron, Isohedron, Johnson Solid, Pentagonal Dipyramid
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Cite this as:
Weisstein, Eric W. "Triangular Dipyramid." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/TriangularDipyramid.html