Symbol 2684 from ISO 7000 - Title/Meaning: Manual activation control Function/description: To identify the manually activated control. On fire detection and alarm systems: to identify a type B manual call point; to prompt a person to operate a manual control to initiate the fire detection and alarm system.
Additional information: 
Symbol may be rotated 90° clockwise. Rotated symbol may be mirror-imaged.
Own work using: iso.org/obp/graphics/grs/ef20f907-eeb9-4aec-bcdd-59607955040e 200.png
Vectorization:  Mrmw