Historical
IEC 81714-2 Ed. 1.0 b:1998
Design of graphical symbols for use in the technical documentation of products - Part 2: Specification for graphical symbols in a computer sensible form including graphical symbols for a reference library, and requirements for their interchang
Specifies requirements for graphical symbols to be included in a reference symbol library in a computer sensible form. The reference symbol library may be used as a basis for the design and editing of documents and for the interchange of documents and grahical symbol library among computer-aided tools. Basic rules are given in ISO/IEC 11714-1
International Electrotechnical Commission [iec]