Well, there are amiga abbreviations common abbreviations in use here, so context is everything. The following is a far from exhaustive list:
Amiga specific:
AGA (also AA): Advanced Graphics Architecture
ECS : Enhanced Chip Set
OCS : Original Chip Set
CIA : Complex Interface Adapter
OFS : Original File System
FFS : Fast File System
SFS : Smart File System
PFS : Professional File System
CDFS: CD File System
FF : Flicker Fixer
RTG : ReTargettable Graphics
EGS : Enhanced Graphics System (? not-quite RTG)
P96 : Picasso96 (example of RTG)
CGX : CybergraphX/ics (example of RTG)
AHI : Audio Hardware Interface
WB : Workbench
KS : Kickstart
UAE : Universal Amiga Emulator (originally Unix/Unusable)
BPPC : BlizzardPPC (accelerator card)
CSMK1/2/3 : CyberStorm Mark 1/2/3 (accelerator card)
CSPPC : CyberStormPPC (basically CSMK3 with PPC)
CV64 : CyberVision64 (graphics card)
CV3D : CyberVision64-3D (graphics card with ancient Virge 3D)
BVPPC : BlizzardVisionPPC (graphics card for BPPC)
CVPPC : CyberVisionPPC (graphics card for CSPPC name is a misnomer, works with 68K-only CSMK3)
Common (hardware):
PCI : Peripheral Component Interconnect
NIC : Network Interface Controller
USB : Universal Serial Bus
68K : 680x0 family processor
PPC : PowerPC family processor
x86 : 80x86 family (and beyond) processor
Common (other)
IIRC : If I recall correctly
AFAIK : As far as I know
ITYM : I think you mean/meant
WTB : Want to buy
WTF : What the f**k
FFS : For f**k's sake