An enneamorphic prototile (Q1065010)

A tiling of the plane is monohedral if each of the tiles is congruent to one tile, called a prototile of the tiling. A prototile admitting, up to congruence, precisely r monohedral tilings is said to be r-morphic. Monomorphic prototiles are common. Dimorphic and trimorphic prototiles were divised by Grünbaum and Shepard. The authors of this note previously gave r-morphic prototiles for \(r<11\) but \(r\neq 9\). They here provide a prototile for the missing case \(r=9\).