This part of ISO/IEC 9592 specifies a set of functions for computer graphics programming, the Programmer's Hierarchical Interactive Graphics System (PHIGS).
ANSI/INCITS/ISO/IEC 9592-1:1997 history
1997ANSI/INCITS/ISO/IEC 9592-1:1997 Information Technology - Computer Graphics and Image Processing - Programmer's Hierarchical Interactive Graphics System (PHIGS) - Part 1: Functional Description