Triquetra 's a word derived from the Latin tri- ("three") and quetrus ("cornered"). Its original meaning was simply "triangle" and it's been used to refer to various three-cornered shapes. Nowadays, it's come to refer exclusively to a certain more complicated shape formed of three vesicae piscis, sometimes with an added circle in or around it. This has been used as a symbol of things and persons that're threefold. Ancient usage Germanic paganism The triquetra has been found on runestones in Nor… (More on Triquetra)