Gwyar:
Welsh goddess of the red dawn and wife of Lludd. She is the sister of Arthur and the mother of Gawain

Triskel:
From earliest times in Celtic tradition, great significance was attached to the number three. Pythagoras called three the perfect number; a tripod will not rock. Three can represent life: male, female and progeny; time: past, present and future; the world: sky, earth and underground.

Mythic literature is full of triads.
The Morrigna - Badb, Macha and Morrigan;
Gaulish gods - Esus, Taranis and Teutates;
Female personifications of Ireland - Eriu, Banba and Fodla:
Gods of craft - Credne, Goibniu and Luchta.