• AM -- Amplitude Modulation, often used to denote AM band -- i.e. 530-1700 kHz
• ant -- antenna
• ad-string -- a series of advertisements
• BCB -- Broadcast Band (530-1700 kHz)
• cw -- continuous wave (as in morse code signals)
• C&W -- country and western (music)
• DX -- a signal from a great distance
• DXO -- DX Ontario (ODXA's monthly publication)
• EZL -- easy listening music
• fmt -- format
• GMT -- Greenwhich Mean Time (see UTC)
• <g> -- denotes a grin  and <G> -- denotes a big grin
• HAS -- Highway Advisory Service radio (see also TIS)
• het -- heterodyne: sound from signals beating against each other such as the  1000 Hz sound caused to 1520 kHz by Saudi Arabia on 1521
• hi -- denotes a laugh
• ID -- identification
• IRC -- International Reply Coupon (world-wide postal note)
• IRCA -- International Radio Club of America
• IS -- interval signal
• kHz -- kiloHerz (1000 Herz): WMVPChicago broadcasts on 1000 kHz
• mHz -- (1000000 Herz): WMVP Chicago broadcasts on 1 mHz
• kc -- Kilocycles: old stuff -- now called kiloHerz
• LAm -- Latin America or a Latin American station
• LW -- Long Wave band (say from about 100-500 kHz or so)
• m -- metre(s), or meter
• mb -- metre band
• mc -- Megacycles: also old stuff -- now called megaHerz
• NA -- national anthemn
• NAm -- North America or a North american station
• NRC -- National Radio Club
• MW -- Mediumw Wave alternate way of describing AM or BCB
• ODXA -- Ontario DX Association
• pgm -- program
• pgm fmt -- program format
• PSA -- public service announcement
• QRM -- interference (from another station)
• QRN -- noise (from various sources)
• QSL -- a verification (hopefully a full-data card) of reception
• RTTY -- radio teletype
• RTV -- Radio Television
• RDTV -- Radiodiffusion Television (as in Radiodiffusion Television Algerienne)
• stn -- station
• SSB -- single sideband
• SW -- Short Wave
• SWBCB -- Short Wave Broadcast Bands (as in 49, 41, 31, 25, etc. metre bands on Short Wave)
• TA -- Trans Atalntic (signal)
• TC (or T/C) -- time check
• TIS -- Travel Information Station or Service (see also HAR)
• TP -- Trans Pacific (signal)
• UTC -- Universal Coordinated Time (or Universal Time Coordinates) same as GMT
• Unid -- unidentified stations (as in Unid LAm)
• u/ -- under: as in u/WMVP (under WMVP)
• v -- variable (as in variable frequency)
• vs -- verification signer (on a QSL)
• WRTH -- World radio and TV Handbook
• w/ -- with: as in w/WMVP (with WMVP)
• 73 -- best wishes
• // -- parallel: as in parallel frequency (RCN Colombia 770 // 780)

 Werner Funkenhauser