Don't know for certain, but I was told that the helmets with the green stickers were those with radio communications. And since the NFL would only allow one of those helmets at a time on the field, they designated them with a green sticker.
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The green dot is the result of a new rule in effect for the 2007 NFL season. The green dot helmet indicates that the helmet is wired with a radio for calling in plays to the quarterback. Only one player with a radio is allowed on the field at a time.
To show how many radios are on the field at a time. This rule was enforced after the Atlanta Falcons had Vick and Schaub, both quarterbacks, on the field at the same time. People began to think that it was unfair for a team to have more than one radio on the field at a time. The green sticker was then enforced to show coaches and refs who had the radios on the field. One defensive and offensive player are allowed to have a radio on the field at a time.
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This sticker shows which players have the radio receiver from the sidelines transmitter. Only one radio is allowed on the field per team.
This sticker shows which player has the radio receiver in their helmet that can receive the plays from the sidelines. Only one receiver is allowed on the field.
The helmet that has a green sticker is meant for the quarterback. It consists of a mike and receiver through which the quarterback can communicate to the coach while still on field.
The green dot is on the quarterback's helmet. It indicates the helmet that is wired to receive communication from the sidelines.