Official AmigaOS 3.9 FAQ: Abbreviations

Abbreviations

Abr.	Expanded	Comment
S-s	Startup-sequence	The Startup-sequence file in SYS:S/ contains AmigaDOS comands that load the Amiga software and handle various hardware and software setup tasks. It is run every time you boot your Amiga. You shouldn't make changes to this file unless it is really necessary.
U-S	User-startup	The User-startup file in SYS:S/ contains your own customized configurations, resident commands, and directory assignments. If it exists, it is automatically run by the S-s.
W-S	WBStartup	A drawer provided on SYS: to hold icons for programs that you want opened at the time Workbench is started.
RTG	ReTargetable Graphics	Usually a software driver kit for a graphic chipset; mostly for graphic cards, but not necessarily (there's a CyberGraphX v3 AGA driver set for PowerPC Amigas [Tony])
P96	Picasso96	Shareware RTG software kit
CGX	CyberGraphX	Commercial RTG software kit (v3 is free, v4 is commercial) [Robert Reisweig]
HDD	Hard Disk Drive	(self-explanatory)
RDB	Rigid Disk Block	The first few blocks of a HDD which contain the vital information for the drive; e.g. partition(s), filesystem(s)
NSD	New Style Device	See the Disk and File Operation page for details
FFS	Fast File System	The standard Amiga filesystem. The OS 3.5 version is v45. Note: "TD64" FFS v44 is a patched* v40 and is not an official update!* [Heinz Wrobel]
PFS	Professional File System	A commercial third party filesystem, not compatible with FFS
SFS	Smart File System	A currently freeware third party filesystem, not compatible with FFS