o pip in a sentence
- Recorded in the 1898 " Signalling Instruction " issued by the War Office and followed by the 1904 Signalling Regulations this system differentiated only the letters most frequently misunderstood : Ack ( originally " Ak " ) Beer ( or Bar ) C D E F G H I J K L eMma N O Pip Q R eSses Toc U Vic W X Y Z . This alphabet was the origin of phrases such as " ack-ack " ( A . A . for anti-aircraft ), " pip-emma " for their " Telephony Spelling Alphabet ", which was adopted by all three services and civil aviation in the UK from 1921.