A *polydrifter* is a figure made by joining such triangles at edges or
vertices.
A *didrifter* is a polydrifter with 2 cells.
Polydrifters are said to be *two-sided*
if mirror images are considered to be the same,
and *one-sided* if they are considered to be different.
On the polyiamond grid
there are 27 different two-sided didrifters,
and 43 one-sided didrifters.

Here I show all 27 two-sided didrifters.

Last revised 2024-08-19.

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Col. George Sicherman [ HOME | MAIL ]