This standard establishes the conventional graphic symbols of general use that are used in the diagrams established by NC 02-07-01:87 "Single Project Documentation System. Diagrams. Classes and types. General rules for their preparation."
NC 02-07-08-1990 history
1990NC 02-07-08-1990 Unified System for Design Documentation. Conventional Graphical Symbols in Diagrams. Symbols for General Purposes