V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

HPUX
       Hewlett Packard / UniX (Unix), "HP/UX"


The Free On-line Dictionary of Computing (30 December 2018):

HP-UX

    The 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)