Symbol 5998 from IEC 60417 - Title/Meaning: Message, confidential Function/description: To identify the control or the indicator for sending and receiving private communication, such as facsimile messages, not to be shared with other people.
Additional information: 
The received message can only be opened by a key such as a secret number or password provided by the sender via a separate channel
Published in: 3C/1571/FDIS, 3C/1577/RVD
Own work using: iso.org/obp/graphics/grs/f1da47ff-6a85-42d0-bf70-d10c5d76be6d 200.png
Vectorization:  Mrmw