I went to many years of Hebrew School and even 4 years of Marshalliah Hebrew High School (after public school) and I did not know about the Yod-Hei admonition. Learn something new here all the time, however I am not Orthodox.

I wonder how many Christians know about the significance of the number 18 (and the multiples of 18), and it’s relationship to the word Life. Gematria is an obscure system….

http://en.wikipedia.org/wiki/Gematria