Symbol 2820 from ISO 7000 - Title/Meaning: Powder Function/description: To indicate a control used to initiate and control the output of powder extinguishing agent used for firefighting, from a firefighting vehicle.
pay attention to orientation of symbolAdditional information: 
The symbol may be mirror imaged.
Own work using: iso.org/obp/graphics/grs/0b8ec20b-f1f8-4d2d-a57d-0a6275ae011a 200.png
Vectorization:  Mrmw