IEC 60073:2002
Basic and safety principles for man-machine interface, marking and identification - Coding principles for indicators and actuators
https://webstore.iec.ch/en/publication/587
Normative references
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050(441), International Electrotechnical Vocabulary (IEV) − Chapter 441: Switchgear, controlgear and fuses
IEC 60050(721), International Electrotechnical Vocabulary (IEV) − Chapter 721: Telegraphy, facsimile and data communication
IEC 60050(845), International Electrotechnical Vocabulary (IEV) Lighting
IEC 60417 (all parts), Graphical symbols for use on equipment
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