Gammadion n. : A cross formed of four capital gammas, formerly used as a mysterious ornament on ecclesiastical vestments, etc. See Fylfot.

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Taxonomy
gammadion, free encyclopedia, swastika, Ancient Greek, ancient symbol, Greek priestesses, search, been suggested that this article, tetra, tattoo, bodies, architectural designs, symbolise, cardinal, corners, guardianship, modern times, Nazi-era.

Defination from the web:
gammadion comes from the fact that it can be seen as being made up of four Greek gamma (Γ) letters. ... In alchemy, the gammadion was used to symbolise the four cardinal corners of the world and the guardianship of this world. ...