Atlas - Popular mount made by Orion. Same as EQ6
ACF - Advanced Coma Free - Type of Meade telescope
ABG - Anti Bloom Gate - Explanation
ALT/AZ - Altitude-Azimuth - A type of telescope mount
AO - Adaptive Optics
AO-7, AO-8, AO-L - SBIG Adaptive Optics products
APO - Apochromat - A type of refractor teleascope
ASA - Astrosysteme Austria - Telescope and mount manufacturer. Homepage
ATS - retailer - Homepage
BIN - Pixel Binning. Explanation
CCD - Type of digital camera image sensor
CMOS - Type of digital camera image sensor
CPC - Series of fork mounted SCT telescopes by Celestron
CN -Cloudy Nights - Popular USA based Astronomy Forum. Homepage
CGE - Heavy Duty Computerized Mount by Celestron.
DEC - Declination - Wiki page
DSI - Series of CCD camera by Meade
DSLR - Digital Single Lens Reflex - type of digial camera
ED - Extra low Dispersion - a characteristic of high quality lenses
ED80 - Popular 80 mm ED refractor by Orion. Product page.
ED127 - 127 mm Triplet made by JOC and sold under a variey of brands.
EQ - Equatorial - A type of telescope mount
EQ5 - Computerised mount by Sky-watcher.
EQ6 - Computerised mount by Sky-watcher.
EQMOD - Telescope scontrol software. Homepage
FLI - Finger Lakes Instruments - Homepage
FOV - Field of View
FWHM - Full width at half maximum. Wiki page.
FSQ - Quadruplet Fluorite Apochromatic Refractor range by Takahashi
GM 8 - Mount by Losmandy Product Page
G-11 - Mount by Losmandy. Product Page
GEM - German Equitoral Mount
GSO - Guan Sheng Optical - telescope manufacturer. Homepage.
HGM TITAN - Mount by Losmandy. Product Page
IIS - Ice In Space - Popular Australian Astronomy Forum. Homepage.
LRGB - Luminance , Red, Green, Blue
MN - Maksutov-Newton - Catadioptric telescope with meniscus lens / corrector plate
NABG - Non Anti Bloom Gate (i.e. this CCD will bloom) - Explanation
NGC - New General Catalogue - well-known catalogue of deep sky objects. Wiki page.
MOAG - Manual Off-Axis Guider by Astrodon
OAG - Off Axis guider
OPT - Retailer. Homepage
PE - Periodic Error
PEC - Periodic Error Correction
PME - Paramount ME - Advanced robotic telescope mount . Product Page
PGC - Principal Galaxies Catalogue. Wiki page
PS - Adobe Photoshop
PST - range of solar telescopes by Coronado. Homepage
PHD - Push Here Dummy - Guiding Software. Product Page.
QSi - CCD Manufacturer. Homepage
RA - Right ascension - Wiki page
RC -Ritchey-Chrétien - specialized Cassegrain telescope designed to eliminate coma. Wiki page.
RCOS - High end Ritchey-Chrétien Manufacturer. Homepage
SCT - Schmidt-Cassegrain telescope - a type of catadioptric telescope. Wiki Page.
SSP - South Celestial Pole
SBIG - CCD Manufacturer. Homepage
SN - Schmidt-Newtonian. Wiki page.
SN8 - 8" Schmidt-Newtonian by Meade
ST / STL / STX - SBIG CCD Camera series
TAK - Takahashi - Japanses telescope and mount manufacturer. USA homepage
TMB - Thomas M. Back - legendary optical designer and optical company
WO - William Optics. Homepage.
This is just a start, send me an email if I missed your favourite.