gammadion
/ɡəˈmeɪdɪən/ /ɡaˈmeɪdɪən/ /ɡəˈmadɪən/noun
A swastika (also more fully cross gammadion, gammadion cross). Also: a figure composed of four capital Greek gammas placed back to back in such a way as to form a voided Greek cross.
Origin
Early 19th century. From (i) post-classical Latin gammadium, plural gammadia.