Symbol 6443 from IEC 60417 - Title/Meaning: Communication ports, bidirectional Function/description: To indicate the port in accordance with a specific standard like IEC 62056-21, Mode C, IEC 62056 DLMS/COSEM, etc.
Additional information: 
For technical details, see IEC 62052-11.
Own work using: iso.org/obp/graphics/grs/523215f9-6a22-42d0-8539-3c520b8feaad 200.png
Vectorization:  Mrmw