regular map

noun2

1. •
   A morphism between algebraic varieties.

   • We now find out how a regular map acts on the ring of regular functions on a closed set.[…]Moreover, regular maps can be characterised as the maps that take regular functions into regular functions. — 1994
2. •
   A symmetric tessellation of a closed surface; a decomposition of a two-dimensional manifold into topological disks such that every flag (incident vertex-edge-face triple) can be transformed into any other flag by a symmetry (i.e., an automorphism) of the decomposition.

   • Just as there are only five regular maps on the sphere (or plane), there are only three classes of regular maps that can be created on a torus. — 1990