Letter A (Flag Semaphore)

This shape represents the Letter A (Flag Semaphore) and the Number 1 (Flag Semaphore).

The presumed signals are letters. The signaller must use the ‘Numerals (Numbers to Follow)’ signal to indicate the next signal should be interpreted as a number. The signaller uses the Letter J (Flag Semaphore)–Letters to Follow–to revert to letters.