??

They are players who are still on the USC payroll.

I agree with the two below me!

That your not pregnant.

which helmets have the radio transmitter

It means you are a ^%&#@$!#@$%.

How many times must this question be asked

ALL READY ANSWERED THIS QUESTION DUMB@ZZ FIGURE IT OUT!!!!!!!

it means you are a dumbass and can not read from week to week that this is the most asked question on here

signifies which helmet is hooked up for radio communication.

this will help the NFL enforce rules that only allow one such communication device on the field at once, and do not let the holder have communication on a kick.

It tells you who is the Quarterback.... That is the only player position that I see with the dot on the back of their helmets!!