hex sign

noun2

1. •
   (US) 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.

   • This association will partially pay for the repainting of hex signs in the tourist areas. — 1984
2. •
   A protective symbol used in Heathenry comprising a six-petaled flower or star set within a circle, as a New Age adaptation of the above.