is a solid formed by joining equal equilateral triangular prisms
at matching faces.
can have any of 32 forms of symmetry, including asymmetry.
Here are minimal examples of them.
Not all are uniquely minimal.
1-Fold Symmetry (Asymmetry)
This tetraprism has no symmetry.
Polyprisms have 7 types of binary symmetry.
Polyprisms may have one form of ternary symmetry,
generated by rotations on the vertical coordinate axis.
Polyprisms have 7 types of quaternary symmetry.
Polyprisms have 7 types of senary symmetry.
Polyprisms have one form of octonary symmetry.
Polyprisms have 7 types of duodenary symmetry.
Polyprisms have one form of 24-fold symmetry.
Last revised 2020-07-18.
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Col. George Sicherman