Symbol 5090 from IEC 60417 - Title/Meaning: Telephone; telephone adapter Function/description: To identify the terminals to which a telephone adapter is to be connected, and to identify telephone booths.
Additional information: 
Published in: First edition, 1973
Own work using: iso.org/obp/graphics/grs/16d22b64-f76f-41a8-9059-91a4f9768be6 200.png
Vectorization:  Mrmw