You might see me use these in my posts concerning Discus. Its good to know that some of these strains are either the same or very similar, and that each breeder tends to name their fish differently, but this is a good overview.
Blue Strains
BD - Blue Diamond
BS - Blue Scorpion
BDSS - Blue Diamond Snakeskin
Cobalt - Cobalt
Red/Orange/Yellow Strains
MR - Marlboro Red
PB - Pigeon Blood
CPB - Checkerboard Pigeon Blood
CNPB - Carnation Pigeon Blood
GM - Gold Melon
Y/W - Yellow White
MG - Millennium Gold
GB - Golden Butterfly
YC - Yellow Crystal
RGD - Red Golden Diamond
3R - Royal Ruby Red
SM - San Merah
RP - Red Passion
SRP - Super Red Passion
MP - Mandarin Passion
3R - Royal Ruby Red
R/W - Red White
RM - Red Melon
SRM - Super Red Melon
RR - Rose Red
RRI - Rose Red Intermediate
White Strains
WD - White Diamond
SW - Snow White
WB - White Butterfly
WBtb - White Butterfly "Throwback"
WS - White Scorpion
Striated Strains
SS - Snakeskin
TSS - Tiger Snakeskin
AF - Altum Flora
FLSS - Fine Line Snakeskin
TT - Tiger Turquoise
CBT - Checkerboard Turquoise
RT - Red Turquoise
BT - Brilliant Turquoise
Spotted Strains
RSG - Red Spotted Green
LSS - Leopard Snake Skin
GLSS - Golden Leopard Snake Skin
GL - Golden Leopard
PE - Penang Eruption
SE - Super Eruption
EL - Eruption Leopard
Albinos
AG - Albino Golden
AS - Albino Snake
AA - Albino Alenquer
AT - Albino Turquoise
AR/W - Albino Red/White
AY/W - Albino Yellow White
ASW - Albino Snow White
ACP - Albino Checkerboard Pigeon
ARGD - Albino Red Golden Diamond (Solid and Striated)
APD - Albino Pearl Diamond
AC - Albino Cobalt
ABD - Albino Blue Diamond
AP - Albino Pigeon
ARB - Albino Royal Blue
ARSG - Albino Red Spotted Green
AMG - Albino Millennium Gold
Other Abbreviations
BH - Beefheart
BW - (Hikari) Bloodworms or (California/Live) Blackworms
BB - Barebottom
X - A cross.. usually seen between two strains of discus
f1 - First generation of a cross