The Horns of Ođin, also referred to as the horn triskelion, is a symbol comprised of three interlocking horns, most likely drinking horns.  The exact meaning of the symbol is not known, though it has a strong link to Ođin and his association with mead.
Mead had a strong spiritual significance to many ancient cultures. To the Scandinavians it was connected to Ođin due to his theft of the 'mead of poetry' from the giants. It also said to be the drink of the warrior's of Valhalla, who are served from an endless supply!

The horns’ names were said to be Óđrœrir, Bođn, and Són.  

Pewter Pendant featuring an image of the Helm of Awe

Supplied on a length of black cord.