凹凸

āotū
  1. concave or convex
  2. bumps and holes
  3. uneven (surface)
  4. rugged

CEDICT

Entry Composition

1 凹 āo concave; depressed; sunken; indented; female (connector etc)
2 凸 tū
  1. to stick out; protruding; convex; male (connector etc)
  2. Taiwan pr. tú