The back side carries the Hebrew word AH'RA'YUT , which means responsibility, referring to the age of 13, BAR MITZVAH, when one takes responsibility for himself and his life.
In Hebrew, this word is of 6 letters, with a very meaningful sequence, as Hebrew is an amazing language where each letter carries hidden and subtle meaning along with its regular meaning. Each font carries hidden values for itself and also when combined with other fonts... The first letter is Alef (A) which is the first letter of the word Ani which is I, saying responsibility