Symbol 6366 from IEC 60417 - Title/Meaning: MWF vacuum cleaner Function/description: To identify the vacuum cleaner for picking up liquids, intended to be used by rescue and firefighting services, integrating a pump for a continuous disposal of the sucked up liquid.
Additional information: 
MWF stands for Mobile Wet and Firefighting. For technical details, see IEC 60335-2-69.
Own work using: iso.org/obp/graphics/grs/a7756245-2b69-454a-9576-cd55aa78479c 200.png
Vectorization:  Mrmw