re: Rookie and Veteran mini camp tryouts

don't you love when they post lists like this (not the OP) and they have a bunch of code letters they add to players numbers but never say what any of them mean or represent?

what do the letter designations after players jersey numbers stand for?

39d Calhoun, Taveze - CB
49s Dominguez, Chase - LS
14 Dural, Travin - WR
88 Fulwood, Ahmad - WR
45o Griffin, Garrett - TE
49d Hightower, Forrest - DB
74o Lauderdale, Andrew - T
68d Lawrence, Devaroe - DT
17o Lawrence, Rashad - WR

if its supposed to be offense, defense, and special teams, then the position already tells you that, so no need for the stupid added letters