A keyhole is the opening in a padlock into which its key is inserted; it is represented as a simple pawn-like shape. The charge appears to be unique to Society heraldry; as no period exemplar has been found for it, the keyhole is no longer registerable. See also chess pieces.
Zarina Daeth bears: Gules, a bend sinister sable fimbriated argent between a whip coiled Or and a heart sable fimbriated and bearing in its sinister chief a keyhole, both argent.
Andrew MacRobb bears: Per pale Or and purpure, a keyhole counterchanged.