This sterling silver charm is the Chai symbol. It is about 14 mm tall and 19 mm wide. This symbol (Chai), commonly seen on necklaces and other jewelry and ornaments, is simply the Hebrew word Chai (living), with the two Hebrew letters Chet and Yod attached to each other. Some say it refers to the Living G-d. Judaism as a religion is very focused on life, and the word chai has great significance. The typical Jewish toast is l'chayim (to life). Gifts to charity are routinely given in multiples of 18 (the numeric value of the word Chai).