A pentahex is a figure made of five regular hexagons joined
edge to edge.
A Galvagni figure is a figure that can be tiled by a polyform
in more than one way—a kind of self-compatibility figure.
A Reid figure is a Galvagni figure without holes.
Most of the pentahex Galvagni and Reid figures were found by
Dr. Michael
Reid of the University of Central Florida.
