Noun
(US, chiefly Pennsylvania) A geometric design usually consisting of a star or flower placed in a circular field, used by the Fancy Dutch on buildings such as barns, often said to be intended as a ward against evil in former times.
(Germanic paganism) A protective symbol used in Heathenry comprising a six-petaled flower or star set within a circle, as a New Age adoptation of the above.
Source: en.wiktionary.org