this should help, i "borrowd" it from reefcentral.com , think many could benafit from it, so i'll make a thread for it too
ACActivated carbon, chemical filtration media / alternating current
AFMAquarium Fish Monthly, magazine
AGAAll-Glass Aquarium, Aquarium manufacturer
ALAqualink, aquarium bulletin board
ATSAlgae turf scrubber, reef setup technique
BODBiological oxygen demand
CCCounter current, type of protein skimmer
CSLCustom Sea Life, lighting manufacturer
CTACellulose triacetate, type of RO membrane
CyanoCyanobacteria
DCDirect current
DDDowndraft, type of protein skimmer
DIDeionisation, type of water purification
DIYDo it yourself
DSBDeep Sand Bed
FAMAFreshwater and Marine Aquaria, magazine
FFEFlying Fish Express, Mail Order Company
FOFish only
FOWLRFish only with live rock
FWFreshwater
GBRGreat Barrier Reef
GPHGallons per hour
HOHigh output fluorescent light
HQIMercury (Hg) Quartz Iodide, a type of metal halide lamp
IAInland Aquatics, mail order company
IMHOIn My Humble Opinion
IMOIn My Opinion
IOInstant Ocean, brand of aquarium salt
IRInfrared
KalkKalkwasser, German for calcium hydroxide solution or limewater
LFSLocal fish store
LHSLocal hardware store
LPSLarge polyped Scleractinian (stoney) coral
LRLive rock
LSLive sand
MACNAMarine Aquaria Conference of North America, held annually
MASNAMarine Aquarium Societies of North America
MDMarine Depot, mail order company
MHMetal halide light
MJMaxijet, powerhead manufacturer
MMMiracle Mud, method of aquarium filtration
MOMail order
NONormal output fluorescent light
NSWNatural seawater
PAPremium Aquatics, mail order company
PCPower compact fluorescent light
PHPowerhead, water pump
PVCPoly vinyl chloride, used for piping / plumbing
RCReef Central, aquarium bulletin board supreme
RCReef Crystals, brand of aquarium salt
RDOReefs.org ("reefs-dot-org"), aquarium bulletin board
RKReef Keeping, on-line aquarium magazine
ROReverse osmosis, type of water purification
RO/DIReverse osmosis, followed by deionisation, type of water purification
RRReef ready, aquaria with pre-drilled holes and overflows
RTNRapid tissue necrosis, protozoal infection of corals; can be rapidly fatal if not treated
SGSpecific gravity
SPSSmall polyped Scleractinian (stoney) coral
SWSaltwater / seawater
TBSTampa Bay Saltwater, Mail Order Company
TFCThin film composite, type of RO membrane
TRTThe Reef Tank, aquarium bulletin board
TWPTap Water Purifier from Aquatic Pharmaceuticals
UGFUndergravel filter
UVUltra violet light
VHOVery high output fluorescent light
W/DWet-dry (a method of aquarium filtration)
WDWet-dry (a method of aquarium filtration)