An antler was a branched structure jutting from an animal's head.
In 2370, Worf speculated that a symbol found in the D'Arsay archive which resembled antlers was suggestive of an animal. (TNG: "Masks")
A chandelier composed of antlers was part of USS Voyager's Beowulf holoprogram in 2371. (VOY: "Heroes and Demons")