Symbol 0855 from ISO 7000 - Title/Meaning: Control of «down slope» time 
Function/description: To identify the device on resistance welding equipment by which marking the unit for controlling down slope time is possible.
Own work using: iso.org/obp/graphics/grs/ff3c08a0-a135-4537-95a2-7d7193b3dde5 200.png
Vectorization:  Mrmw