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'''Ten-codes''', or '''10-codes''', are used in two-way voice [[radio]] communication as numeric [[codeword]]s for frequently used messages. They originated in the [[United States]] [[law enforcement]] community before [[World War II]].
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==Origins and professional use==
The first set of 10-codes was published by the Association of Public-Safety Communications Officials, or APCO, in January of 1940. There is no universal, official set of 10-codes, and the meanings of a particular 10-code can vary between one jurisdiction and another: a code meaning "I have the suspect in custody" in one state can mean "Send an ambulance" in a second state, and have yet another meaning in a third. To overcome large 10-code lists some agencies have adopted other code lists such as [[eleven-code|11-codes]], 12-codes, and so forth. As of 2005, 10-codes are being phased out by most U.S. law enforcemnt agencies because of a Federal requirement for plain language to facilitate communication between agencies in emergencies.
==Unofficial use (e.g. CB radio)==
Ten-codes were adopted with enthusiasm by the [[Citizen's Band radio|Citizen's Band]] craze, first in the United States, then shortly afterwards in the [[United Kingdom|Britain]] and elsewhere. The codes were extended and changed to reflect the sorts of things that CBers wanted to refer to, rather than law enforcement usage, etc. During the [[CB radio in the United Kingdom|height of the fad]] in Britain (around [[1980]]), new ten-codes were seemingly made up on the spot, used in the local area for a short time, then disappeared again.
==List of commonly used codes==
The following is a sample of commonly used 10-codes, submitted for purposes of illustration. It is common for 10-codes to have numeric gaps between them. ▼
▲The following is '''a sample of commonly used 10-codes, submitted for purposes of illustration. It is common for 10-codes to have numeric gaps between them.
'''
* 10-1 poor reception
* 10-2 good reception
* 10-99 wanted/stolen record
* 10-100 dead body
* 10-200 alarm'''==See also==
==See also==
* [[Q code]]
* [[voice procedure]]
* [[Z code]]
==External links==
*[http://www.peace-officers.com/content/tencodes/codeindex.shtml Partial list of US law enforcement ten-codes]
[[Category:Encodings]]
[[Category:Law enforcement techniques]]
[[Category:Radio]]
[[Category:Famous numbers|10]]
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