| 凹 |
āo tū | concave or convex / bumps and holes / uneven (surface) / rugged |
| 凹 |
āo | concave; depressed; sunken; indented; female (connector etc) |
| 凹 |
wā | variant of 洼 / (used in names) |
| 凸 |
tū | to stick out; protruding; convex; male (connector etc) / Taiwan pr. [tu2] |