Maritime
Merchant and naval vessels are assigned call signs by their national licensing authorities. In the case of states such as Liberia or Panama, which are flags of convenience for … See more

Broadcasters are allocated call signs in many countries. While broadcast radio stations will often brand themselves with plain-text names, … See more

In wartime, monitoring an adversary's communications can be a valuable form of intelligence. Consistent call signs can aid in this monitoring, so in wartime, military units often employ See more

A directory of radio station call signs is called a callbook. Callbooks were originally bound books that resembled a telephone directory and … See more

Amateur radio call signs are in the international series and normally consist of a one or two character prefix, a digit (which may be used to denote a geographical area, … See more

No call signs are issued to transmitters of the long-range navigation systems (Decca, Alpha, Omega), or transmitters on frequencies See more

• Brevity code
• Glossary of military abbreviations
• List of aviation, avionics, aerospace and aeronautical abbreviations
• List of aviation mnemonics See more