It's an inside joke about numbers guys, you see people in the M.A. (main arena) that use the default numbers as their cpid (computer player identification) & have squeeky voices because they haven't reached puberty yet.
So if you see a numbers guy like this -----> 99873564 & he sounds like Mickey Mouse....be prepared to squelch him, because he is going to hold his radio button down & tell you every little move he is making even to the point of saying "I bailed out, someone cover me until I can get pick-up on the ground!" over & over....& over
But not all numbers guys are like that, some are just shades (second accounts) for regular players.