Symbol 5061 from IEC 60417 - Title/Meaning: Horizontal synchronization Function/description: To identify the horizontal synchronisation control, for example of a television receiver or a monitor.
Additional information: 
Published in: First edition, 1973
Own work using: iso.org/obp/graphics/grs/36eea9fd-4925-419d-bcc8-5aceea3b12f3 200.png
Vectorization:  Mrmw