Yeah, Nimoy's adaptation of that gesture is cool.
Originally Posted by refugeeguru
There seems to be a connection with samek in the blessing because that is the 15th letter with the value of 60:
3 + 5 + 7 = 15
15 + 20 + 25 = 60
I just Googled it and found that there are lots of connections between the Aaronic Blessing and the letter Samek. Here's one quick example:
The numerical value of the samech, the fifteenth letter of the alef-beis, is sixty. In the Priestly Blessing recited every morn*ing there are fifteen words and sixty letters. When the kohen blesses the people, he must put his two hands together. According to the Mishnah there are thirty bones in each hand, sixty when the hands are joined. The Aaronic blessing is marked in the text with three sameks - one after each verse. There's probably a lot more going on here. For example, 15 + 60 = 75 = Kohen (Priest).
What is unique about the Priestly Blessing? The results of such blessings are swift and without interruption, similar to the strength of a current of mighty water that no dam can stop. The Priestly Blessings embody the concept of the samech: infinite light and power.