Symbol 5521B from IEC 60417 - Title/Meaning: Video input/output Function/description: Alternative graphical representation. Same meaning as 5521A.
Additional information: 
Published in: Supplement M, 1994
Own work using: iso.org/obp/graphics/grs/de39fc14-e1d5-4f92-8bbe-de2dfe727e8a 200.png
Vectorization:  Mrmw