What is the meaning of Triquetra?

(pl.) of Triquetrum.
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APAWebster's. (2011). Triquetra. Retrieved October 18, 2018, from http://smartdefine.org/triquetra/definitions/2074864
ChicagoWebster's. 2011. "Triquetra" http://smartdefine.org/triquetra/definitions/2074864 (accessed October 18, 2018).
HarvardWebster's 2011, Triquetra, Smart Define, viewed 18 October, 2018, <http://smartdefine.org/triquetra/definitions/2074864>.
MLAWebster's. "Triquetra" 28 May 2011. Web. 18 October 2018. <http://smartdefine.org/triquetra/definitions/2074864>