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See also Codes and Alphabets#CW_Abbreviations
10 code: A series of abbreviations (originally 10-1 through 10-29) created by APCO, the US association of public safety communications officers, for use on 1950's-era police radio. As many localities extended the series with their own non-standard codes, the same codes may have different meanings in different agencies (even between police and fire services in the same town). Ten codes are never used in amateur, marine or aviation radio as Q-codes already are in long-established international use but they may be heard in the unlicensed CB radio service and on local public-service frequencies.
11 metres: The 27MHz CB general radio service, nominally intended for local communications. As no license or callsign is required to transmit, quality of operating procedure employed on this band may be criticised as variable at best. Where existing citizen's band procedure, code abbreviation and slang terminology are incompatible with amateur radio operating convention, users will find much needs to be re-learned upon leaving 11 metre CB to become licensed radio amateurs.
2, 6, 10, 20, 40, 80, 160 metres : See Bands.
30: End of message.
33: Love sealed with friendship and mutual respect between one YL and another YL. (coined by Clara Reger W2RUF, adopted officially by YLRL in 1940)
73: Goodbye, best regards.
88: Love and Kisses
92 code : A series of telegraphic abbreviations devised by Western Union in 1859 (originally as numbers 1 to 92). The later Philips Code added abbreviations for news wire service. While many of the codes are long forgotten, 19 and 31 (absolute and permissive) train orders continue in railroad use, the "30" as used by news editors at the end of a story remains widely known and "73" / "88" greetings are common in amateur radio.