flat level plain
convex
concave hollow pit hole cavity

Two lines

The end of one meeting with the end of the other
Two lines ; sharp ; convex TOOTH, Cusp, Point, Neb, Scrag, Tine, Tenon, Cog, ingrail, indented.
Two lines ; sharp ; concave NOTCH, Nick, Nock, crenated, Gap, hatcht, inveck, indented.
Two lines ; blunt ; convex PROTUBERANCE, Prominence, Process, Stud, Boss, Excrescence, Gibbous, •rump, Bunch, Knob, Rub, jutting, rising, tuberous, standing out, stick out, goggle, copped, turgid, Brow, Hillock, Knob, Knot, Node, Cragg, Scrag, Lobe, gorbellied, heave, swell, strut.
Two lines ; blunt ; concave DENT, Dimple, Sinking, Dock, Crease, indent, Hole, Pit.

flux or extended repitive pattern

Cusp EDG, Sharp.
notch GVTTER, Chamfer.
Protuberance: RIDGE, Bank, Dam, Bridg, Edg, Ledg.
Dent FVRROW, Ditch, Dike, Kennel, Channel, Foss, Trench, Dock, Drein, Cut, Dimple, Rivel, Shrivel, Wrinkle, rumple, pucker, Pleit.