Symbol 5069 from IEC 60417 - Title/Meaning: Vertical linearity Function/description: To identify the control for the linearity of, for example, a television receiver or a monitor.
Additional information: 
Published in: First edition, 1973
Own work using: iso.org/obp/graphics/grs/e35a6802-0468-4e50-9b97-10a9f448a992 200.png
Vectorization:  Mrmw