The second branches of a stag's horn.
“In a hart the main horne itself they call the beame. The lowest antlier is called the brow-antlier; the next, roial; the next that, surroial; and then the top.”
“In a buck, they say bur, beame, braunch, advauncers, palme, and speilers.”
—Marwood: Forest Lawes.