| HTML Entity (dec) | ¿ |
| HTML Entity (hex) | ¿ |
| UTF-8 (hex) | 0xc2bf / 0xc2 0xbf (2 bytes) |
| UTF-8 (dec) | 194, 191 (2 bytes) |
| UTF-16-BE (hex) | 0xbf / 0x00 0xbf (2 bytes) |
| UTF-16-BE (dec) | 0, 191 (2 bytes) |
| UTF-32-BE (hex) | 0xbf / 0x00 0x00 0x00 0xbf (4 bytes) |
| UTF-32-BE (dec) | 0, 0, 0, 191 (4 bytes) |
| C/C++/Java source code | "\u00bf" |
| Python source code | "\u00bf" |