A triquetra is a design common in ecclesiastical art, where it is a symbol of the Trinity. It consists of three semi-circular arcs interlaced, the ends conjoined to form a knot. The triquetra is a period charge: under the name “Tyrell knot”, it was the badge of Sir Thomas Tyrell, d.1502 [Walden 129; Siddons II.2 295]. Though Tyrell used the charge with a point to base, the Society default for the triquetra is with a point to chief.
Tarynsa of Rivendell bears: Azure, three triquetras Or.
Ástríðr in spaka bears: Argent, three triquetras vert.
Ciaran ferch Marc bears: Quarterly sable and vert, in saltire five triquetras argent.