The term "ossicone" refers to the horn-like (or antler-like) protuberances on the heads of giraffes, male okapis, and their extinct relatives, such as Sivatherium, and the climacoceratids, such as Climacoceras. Ossicones are similar to the horns of antelopes and cattle, save that they're derived from ossified cartilage, and that the ossicones remain covered in skin, rather than horn.… (More on Ossicone)