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 limbs. 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 Classical Greece.
In the Hellenistic period, the symbol became associated with the island of Sicily, appearing on coins minted under Dionysius I of Syracuse beginning in c. 382 BCE. It later appears in heraldry, and, other than in the flag of Sicily, came into use in the arms and flags of the Isle of Man (known in the Manx language as ny tree cassyn 'the three legs').
Greek ...