Number 4 (Flag Semaphore)

A two-flag semaphore position representing the numeral 4 after the Numbers Follow signal.

The physical position is the same as semaphore letter D. The preceding procedural signal tells the receiver to interpret it as 4 rather than D.

The signaller holds one flag in each hand at the prescribed angles illustrated in the entry. The receiver reads the position from the signaller’s front, with a clear pause or procedural signal used where interpretation could be ambiguous.