Symbol 2018 from ISO 7000 - Title/Meaning: Continuous underline 
Function/description: To identify the control to underline the characters of a specified sequence of characters, including the intercharacter spacing.
Own work using: iso.org/obp/graphics/grs/23b81a50-f9d8-4d46-b5e9-9f896817064f 200.png
Vectorization:  Mrmw