v.fit together exactly, of identical shapes

"triangles tesselate"

Studies on the tesselate stylet nematode
Rapid zippering for real time tesselation of bicubic surfaces
Geometry of orientation and ocular dominance columns in monkey striate cortex
Spectral covariance and fuzzy regions for image indexing
THE EARLY RADIATION AND PHYLOGENY OF ECHINODERMS
Conventional and unconventional Turing patterns
Packings ofR^nby certain error spheres
Adaptive tesselation of subdivision surfaces
The effect of spatial discretization on the magnitude and direction response of simple differential edge operators on a step edge
McKay correspondence