Symbol 5633-2 from IEC 60417 - Title/Meaning: Three component video input, digital Function/description: To identify controls and connecting terminals specifically meant for digital three component video input.
Additional information: 
Published in: Supplement O, 1996,3C/293/DIS
Own work using: iso.org/obp/graphics/grs/4bc86841-4845-49cd-a8ee-8bf260d2722b 200.png
Vectorization:  Mrmw