Triskelion (Triskele) Artifact from the Archaeological Museum of Olympia, Greece:

A triskelion or triskele (which invariably has rotational symmetry) is a motif consisting of three interlocked spirals, three bent human legs, or three bent/curved lines extending from the center of the symbol. Both words are from Greek “τρισκέλιον” (triskelion) or “τρισκελής” (triskeles), “three-legged”, from prefix “τρι-” (tri-), “three times”] + “σκέλος” (skelos), “leg”. Although it appears in many places and periods including 3200 BCE Newgrange, it is especially characteristic of the Celtic art of the La Tène culture of the European Iron Age.

The triskelion symbol appears in many early cultures, the first in Malta (4400–3600 BC) and in the astronomical calendar at the famous megalithic tomb of Newgrange in Ireland built around 3200 BC, Mycenaean vessels, on coinage in Lycia, and on staters of Pamphylia (at Aspendos, 370–333 BC) and Pisidia. It appears as a heraldic emblem on warriors’ shields depicted on Greek pottery.

Familiar as an ancient symbol of Sicily, the symbol dates back to when Sicily was part of Magna Graecia, the colonial extension of Greece beyond the Aegean.Pliny the Elder attributes the origin of the triskelion of Sicily to the triangular form of the island, the ancient Trinacria (from the Greek tri- (three) and akra (end, limb)), which consists of three large capes equidistant from each other, pointing in their respective directions, the names of which were Pelorus, Pachynus, and Lilybæum.

The Celtic symbol of three conjoined spirals may have had triple significance similar to the imagery that lies behind the triskelion. The triple spiral motif is a Neolithic symbol in Western Europe. It is considered a Celtic symbol but is in fact a pre-Celtic symbol.It is carved into the rock of a stone lozenge near the main entrance of the prehistoric Newgrange monument in County Meath, Ireland. Newgrange, which was built around 3200 BC, predating the Celtic arrival in Ireland but has long since been incorporated into Celtic culture.