From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :
HPUX Hewlett Packard / UniX (Unix), "HP/UX"From The Free On-line Dictionary of Computing (30 December 2018) :
HP-UXThe version of Unix running on Hewlett-Packard workstations. HP-UX conforms to X/Open's Portability Guide Issue 4 ({XPG4), Federal Information Processing Specification (FIPS) 151.1, POSIX 1003.1, POSIX 1003.2, AT&T's System V Interface Definition 2 ({SVID 2). HP-UX incorporates selected features from the University of California at Berkeley Software Distribution 4.3 ({4.3BSD). It is known by some as "{HP-SUX". [Features?] (1997-05-12)