Ossicone

Not to be confused with Ossicles.
Ossicones of a giraffe
Ossicones of a male okapi

Ossicones are columnar or conical skin-covered bone structures on the heads of giraffes, male okapi, and some of their extinct relatives. Ossicones are distinguished from the superficially similar structures of horns and antlers by their unique development and a permanent covering of skin and fur.