Symbol 2240 from ISO 7000 - Title/Meaning: Rearward-moving-vehicle alarm, cancel 
Function/description: To identify the control that cancels or switches off the rearward moving alarm.
Own work using: iso.org/obp/graphics/grs/5e79fbcd-e853-40d3-82e6-f42281b991b3 200.png
Vectorization:  Mrmw