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

Rlated article on Qiita

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https://qiita.com/kaizen_nagoya/items/587cfc2bf96242c31427

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https://qiita.com/kaizen_nagoya/items/9c0bd9b2befd55c23ae7

IEC 60073:2002 Basic and safety principles for man-machine interface, marking and identification - Coding principles for indicators and actuators
https://qiita.com/kaizen_nagoya/items/118af2027128b4634598