Plume (from Fr. Plumage - «plumage"; fr. Plume - «Pen") - an ornament on a headdress of feathers type of fan.
Since ancient times and still used on horse harness or military headgear in some armies (British, Canadian, Indian, Malaysian, Pakistani, etc.). It is considered a symbol of power and triumph. It is used as an attribute of a priest in Taoism.
Likely originated from imitating the peacock's tail.
POWER, Triumph, Vanity and DEATH