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That's called the challenge flag, each coach gets to throw that flag in their sock in order to signal to the refs that they disagree with the call on the field and would like them to take another, closer, look at the play. If the challenge succeeds, the play is reversed. If the challenge fails, the coach loses a timeout. If the team has no more time outs then they cannot challenge a play.

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12y ago
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Q: Why do NFL coachs carry red flag in there sock?
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