Symbol 1641 from ISO 7000Title/Meaning/Referent: Operator's manual; operating instructions
Function/description: To identify the location where the operator's manual is stored or to identify information that relates to the operating instructions. To indicate that the operating instructions should be considered when operating the device or control close to where the symbol is placed.
https://www.iso.org/obp/ui/#iso:grs:7000:1641
Vectorization:  IngenieroLoco