Brevity codes are used in amateur radio, maritime, aviation and military communications. The codes are designed to convey complex information with a few words or codes. Some terms are classified to the public.
Multiservice tactical brevity code used by various military forces. The codes' procedure words, a type of voice procedure, are designed to convey complex information with a few words, when brevity is required but security is not
Ten-code, North American police brevity codes, including such notable ones as 10-4