| U+ | art-254 |
| 0333 | |
| Unicode Character Names | art-315 | COMBINING DOUBLE LOW LINE |
| Unicode Character Names | art-315 | NON-SPACING DOUBLE UNDERSCORE |
| American English | eng-004 | COMBINING DOUBLE UNDERSCORE |
| français | fra-000 | DIACRITIQUE DOUBLE TRAIT SOUSCRIT |
| français | fra-000 | DOUBLE SOULIGNÉ |
| français | fra-000 | DOUBLE TIRET BAS |
| français | fra-000 | DOUBLE TIRET BAS DOUBLE SOULIGNÉ |