Symbol 6056 from IEC 60417 - Title/Meaning: Caution, moving fan blades Function/description: [To indicate the instructional safeguard to keep away from moving fan blades.In case of application as a warning sign the rules according to ISO 3864 shall be adhered to.]
Additional information: 
The symbol element in the equilateral triangle was standardized in ISO 7000-0089.
Own work using: iso.org/obp/graphics/grs/dc06f60e-8bf9-4785-8174-eed1995692c5 200.png
Vectorization:  Mrmw