This equal armed cross is known as a Celtic Sun Cross and a Wheel Cross. Featuring four equal arms within a circle, this symbol represents the unity of  the Sun with the balancing of the four directions and the four elements, bringing forth eternal life. The triquetra (triple knots) are the powers of 3:
Maiden, Mother, Crone
Earth, Sea, Sky
Life, Death, Rebirth
Father, Son, Holy Spirit 
This pendant comes with a black leather cord. Pendant size: 1 7/8 inches
Silver metal (likely pewter) on wood