Symbol 5957 from IEC 60417 - Title/Meaning: For indoor use only Function/description: To identify electrical equipment designed primarily for indoor use.
Additional information: 
See also the symbol 5109
Published in: 3C/1198/FDIS
Own work using: iso.org/obp/graphics/grs/be93c102-77bf-410b-b727-8346643d2744 200.png
Vectorization:  Mrmw