WordNet sense 1 (perennial subshrub of Tenerife having leaves in rosettes resembling pinwheels):

Aeonium haworthii

WordNet sense 2 (a toy consisting of vanes of colored paper or plastic that is pinned to a stick and spins when it is pointed into the wind):

pinwheel wind collector

WordNet sense 3 (a circular firework that spins round and round emitting colored fire):

catherine wheel