ARC

ARC might refer to
 * ARC (compression format) (mostly for IBM PC / compatibles / DOS)
 * ARC (Commodore)
 * ARC (database backup format) (Oracle)
 * ARC (FreeArc)
 * ARC (Internet Archive)
 * ArcFS
 * ArcMac
 * ARQ
 * BSArc and BSA
 * ChArc
 * IDArc
 * RARC (Nintendo)
 * WARC (successor to Internet Archive ARC)

And see also ARK, and NOAH, named after somebody known for building an ark.