Symbol 5056 from IEC 60417 - Title/Meaning: Brightness; brilliance Function/description: To identify the brightness control, for example of a light dimmer, a television receiver, a monitor, an oscilloscope.
Additional information: 
Published in: First edition, 1973
Own work using: iso.org/obp/graphics/grs/9ed3058a-d4f4-43f2-8043-7c141394a2be 200.png
Vectorization:  Mrmw