art, Celtic Reconstructionists use the triquetra either to represent one of the various triplicities in their cosmology and theology (such as the tripartite division of the world into the realms of Land, Sea and Sky), or as a symbol of one of the specific Celtic triple goddesses, for example the battle goddess, The Morrígan. The symbol is also sometimes used by Wiccans, White Witches, and some New Agers to symbolise the Triple Goddess, or as a protective symbol. In the 1998-2006 American fantasy drama Charmed, that ran on the now defunct The WB network, the triquetra was prominently used as a symbol on the Halliwell's Book of Shadows, the book of spells, potions, and other information the sisters used to fight evil. The triquetra was also used as a symbol of Charmed Ones and their collective Power of Three. The triquetra would be seen to fracture and pull apart on the Book of Shadows when their bond was temporarily broken by a demon. It was also featured prominently in the opening credits of each episode throughout its eight season run. The symbol was also used in the 2018 reboot that ran on The CW. In the TV series The Walking Dead (2010), Michonne's katana features a triquetra, chosen for its meaning as a "triple goddess symbol". In the German Netflix series Dark (2017), it symbolizes the caves' closed time loops with each loop being 33 years apart, with the past affecting the future and the future influencing the past. The Triquetra is of significant symbolic value to the time travelers. This symbol can be seen on the Cave's metal door, on the Emerald Tablet, in The Stranger's papers, and in the Sic Mundus photo. Thor's hammer, Mjölnir, dons the Triquetra on its surface in the 2011 film Thor. After Odin speaks the words, "Whosoever holds this hammer, if he be worthy, shall possess the power of Thor,” to Mjölnir, the Triquetra vanishes. It represents Asgard, Midgard, and Utgard. Gallery Variant forms See also Borromean rings Three hares References Further reading H. Trætteberg, E. Moltke, I. Lindeberg, "Triquetra" in: Kulturhistorisk leksikon for nordisk middelalder, vol. 18 (1982), p. 634–6356. Martin Blindheim: Graffiti in Norwegian stave churches c. 1150 – c. 1350, Oslo 1985, i.a. p. 44–45 External links Celtic art Christian symbols Church architecture Early Germanic symbols Iconography Irish culture Ornaments Religious symbols Romanesque art Rotational symmetry Symbols Visual motifs Piecewise-circular