Symbol 5525A from IEC 60417 - Title/Meaning: Video input Function/description: To identify video equipment input controls and connecting terminals.[]This symbol applies also when an audio signal is included.
Additional information: 
To qualify this symbol, symbols such as 5048, the analogue sign or the digital sign may be added, in accordance with the user's documentation.
The outline of the symbol may be interrupted at the entrance of the signal as shown in symbol 5525B
Published in: Supplement M, 1994
Own work using: iso.org/obp/graphics/grs/b000831c-4e75-4164-95a0-b8df91c1f882 200.png
Vectorization:  Mrmw