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Each country has a set of alphabetic or numeric [[International Telecommunication Union]]-designated [[ITU prefix|prefixes]] with which their call signs must begin. For example:
* The [[United States]] uses the prefixes: ''W'', ''K'', ''N'', and ''AAA'' to ''ALZ''. Only ''W'' and ''K'' are used by broadcast stations. There are zones which come after the first letter, denoted by a number.
* [[Canada]] uses the prefixes: ''CF''-''CK'', ''CY''-''CZ'', ''VA''-''VG'', ''VO'', ''VX''-''VY'', ''XJ''-''XO'' ([[Canadian Broadcasting Corporation]] (CBC), uses ''CB''). (Stations beginning with VO were allocated to [[Newfoundland]], before it joined confederation with Canada in [[1949]] and [[grandfather clause|grandfathered]] into Canada's prefixes.)
* [[Mexico]] uses ''XA''-''XI''. Broadcast stations use the prefix ''XE'' on the [[mediumwave]] [[AM radio|AM]] band and ''XH'' for television.
* The [[United Kingdom]] uses the prefixes: ''G'', ''M'', ''ZB''-''ZJ'', ''ZN''-''ZO'', ''ZQ'', and ''2''