The Coat of Arms of the Isle of Man, blazoned Gules three legs in armour flexed at the knee and conjoined at the thigh, all proper, garnished and spurred or, dates from the late 13th century. The present version dates from 12 July 1996. As the Isle of Man is a Crown dependency and the present Lord of Man is King Charles III of the United Kingdom, the arms are more accurately described as the Arms of His Majesty in right of the Isle of Man. The origin of the triskeles is obscure, but it appears to stem from the Scottish takeover of the island in 1265. The heraldic supporters are birds associated with the island, whilst the motto first appears on record in the 17th century.

A triskelion or triskeles is an ancient motif consisting either of a triple spiral exhibiting rotational symmetry or of other patterns in triplicate that emanate from a common center. The spiral design can be based on interlocking Archimedean spirals, or represent three bent human legs. It occurs in artifacts of the European Neolithic and Bronze Ages with continuation into the Iron Age – especially in the context of the La Tène culture and of related Celtic traditions. The actual triskeles symbol of three human legs is found especially in Greek antiquity, beginning in archaic pottery and continued in coinage of the classical period.