A triominoid is a solid figure formed by joining
three unit squares edge to edge at straight or right angles in three dimensions.
There are nine triominoids, not counting reflections:
A compatibility figure is a figure that can be tiled by
any of a set of two or more polyforms.
Here are minimal compatibility figures for pairs of triominoids.
They are not all uniquely minimal.
In these solutions the tiles do not interpenetrate.
Back to Pairwise Compatibility
Col. George Sicherman