440 decoding guys, i need a minute

ive searched the net everywhere , including my FSM and i cannot for the life of me find out what the 2 - maltese cross - X means on the pad. i know its the main journal size (and rod?). i know the 7T440E is 1977 trenton 440 cast crank and the 5 11 is the date code. but what is the rest? also, what is the numerical number for the standard size of the main and rod journals on a 73 and up cast crank ? and do the 2 + X represent over or under size main (and rod?) journals ? i cant find squat for info . thanks guys