First a restaurant entices customers with advertising showing and describing delicious and reasonably priced food. When the prospective customer walks by the establishment he is further interested by the pleasant aromas wafting out of the kitchen. Once he walks into the restaurant, the Captain welcomes him in with a flourish and a smile and escorts him to the table which has been attractively set with fine china and silver. The waiter then describes the many mouth-watering delicacies from which the customer can choose. So too is the process with introducing some Jews to Judaism.
Codes can be the aroma, the decor, the china and silver, the garnish, the anticipation.
The actual flavor and nutrition of Judaism will come later. But first, you have to get the customer in the door. There is a discussion of the development of the alphabet in the Encyclopedia Judaica but the question of the final letters kaph, mem, nun, pe, zadi is addressed specifically in the Jewish Encyclopedia. The interesting point that emerges is that the final letters are closer to the older forms of the script than their counterparts that appear in the middle or beginning of words. According to the article, there is a tendency in the development of the Hebrew characters to give the letters such forms that whole words would be written with as few breaks as possible.