Unicorn

A fabulous beast in the form of a horse, but with a beard like that of a goat, the legs of a buck, the tail of a lion, and a long slender tapering horn, twisted spirally, in the middle of the forehead. The royal arms of Scotland had unicorns for supporters until the union with England in 1603. Since then, the lion and the unicorn are used to support the Royal Arms of Great Britain to represent England and Scotland respectively.

Unicorn passant ducally gorged and lined 

Unicorn salient collared and chained

See Monsters and Mythical Creatures