Symbol 5250 from IEC 60417 - Title/Meaning: Conference Function/description: To identify the control enabling selected subscribers to confer.
Additional information: 
Published in: Supplement L, 1993
Own work using: iso.org/obp/graphics/grs/b35fd28b-1931-40af-93df-9f95d3c21dda 200.png
Vectorization:  Mrmw