Symbol 6008 from IEC 60417 - Title/Meaning: Slope, increasing Function/description: To identify the control or function regulating the increase of a value.
Additional information: 
Control is identified by one letter chosen in IEC 60974-1, table L.1.
The meaning of the graphical symbol depends on its orientation.
Own work using: iso.org/obp/graphics/grs/8f3ae8d5-0f56-4c02-b2d7-734d13118581 200.png
Vectorization:  Mrmw