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Red for a foul.
Also known as: Foul signal athletics, Failed trial flag
The athletics field-event signal showing that a throw or jump was illegal and will not be measured.
Signals that the trial was a foul and will not be measured.
Contexts: Public information
Binary against the white flag with no third option, so a judge cannot signal doubt — the system forces a decision at the moment of the attempt.
Contexts: Public information
A plain red rectangular flag on a short staff, raised vertically by the judge immediately after the attempt in place of the white one.
White signals a legal trial and red a foul, with no third option available to the judge.