The 3 rays represent the same as the 3 dots, and there is 2 places that you would normally stamp the lil' cross. (1) In the web area between your thumb and your index finger, or (2) In-between your eyebrows - as in the pachuco style.
3 rays = "MI VIDA LOCA" (My Crazy Life) right next and atop the cross in representing the hoped-for/sought-out protection and forgiveness by "CHUCHITO" (Lord Jesus) in the old-school traditional style.
Some Varrios also used to paste up on their wall-placas "a block styled cross." They spray painted it or brush painted on the walls, and inside of it - they would put in their Varrio name or some other affiliated info.
It's a trip that you brought up this question, because just the other day a young vato asked me about it and was interested to know what it meant and how it originated, because some other vatos who he knows have it stamped.