sovatthika : [nt.] a savastika; a mark like S on the hood of a cobra. 

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Sovatthika (adj.) [either fr. sotthi with diaeresis, or fr. su+atthi+ka=Sk. svastika] safe M i.117; Vv 187 (=sotthika VvA 95); J vi.339 (in the shape of a svastika?); Pv iv.33 (=sotthi -- bhāva -- vāha PvA 250). -- âlankāra a kind of auspicious mark J vi.488.

Pali-English Dictionary, TW Rhys Davids, William Stede,

【中】 卍，眼鏡蛇膨脹的頸部的 S 標誌。

A Chinese Translation of A.P. Buddhadatta Concise Pali-English Dictionary