This standard PD IEC/TR 61734:2006 Application of symbols for binary logic and analogue elements is classified in these ICS categories:
29.020 Electrical engineering in general
31.020 Electronic components in general
01.080.30 Graphical symbols for use on mechanical engineering and construction drawings, diagrams, plans, maps and in relevant technical product documentation
Contains conventions, helpful when applying IEC 60617 to symbols for catalogues of real devices, and shows preferable choices where alternative techniques are provided in the standard. It also helps to create symbols having as consistent an appearance as possible, not depending on the originator, while still accurately representing the function.