Symbol 5413 from IEC 60417 - Title/Meaning: Electronic image, gamma control Function/description: To indicate a reference to control of gamma.
Additional information: 
Published in: Supplement G, 1985
Own work using: iso.org/obp/graphics/grs/0022aef7-e0f2-4928-a126-494bf3528ead 200.png
Vectorization:  Mrmw