The Elder Sign is an icon in the Cthulhu Mythos, first mentioned in H. P. Lovecraft's "The Dream Quest of Unknown Kadath", written in 1926. It is a protective symbol that defends it's bearer or a place marked by it, from the mythos creatures.
There are a few versions of the Elder Sign. This one here is a copy of the drawing made by Lovecraft in one of his letters to Clark Ashton Smith.

The pendant is made of sterling (925) silver. It's dimensions are: 1.8cm (0.7 inch) by 3.1cm (1.2 inch). The pendant's loop is 3,5mm (0,13 inch) wide.

A leather cord is included with the pendant.