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The assistant referee's raised flag, then angled to show where the offence occurred.
Also known as: Linesman's flag
The assistant raises the flag straight up to signal offside, then — once the referee has stopped play — angles it to show where on the pitch the offence happened: high for the far side, level for the middle, low for the near side.
Raised vertically to indicate an offside offence, then held at one of three angles to show the area of the pitch in which it occurred. The Laws specify both the signal and the three positions.
The flag signals the offence; the decision remains the referee's. An assistant may raise the flag and see play continue, because the referee has judged that no offside offence was committed.
A rectangular flag on a short handle, held vertically above the head and then lowered to one of three fixed angles.
Both belong to the signalling the Laws define for match officials.