This part of ISO/IEC 9592 specifies a set of functions for computer graphics programming, the Programmer&8217;s Hierarchical Interactive Graphics System (PHIGS).
ANSI/ISO 9592-1:1989 history
1989ANSI/ISO 9592-1:1989 Information Processing Systems - Computer Graphics - Programmer's Hierarchical Interactive Graphics System (PHIGS) (Part 1: Functional Description)