Symbol 6441 from IEC 60417 - Title/Meaning: Communication ports, inductive port Function/description: To indicate the inductive port, bidirectional.
Additional information: 
For technical details, see IEC 62052-11.
Own work using: iso.org/obp/graphics/grs/3037117b-f9ee-4098-b2b9-081c1036e858 200.png
Vectorization:  Mrmw