| Codepage | Character | Description | UTF-8 codepoint | UTF-8 bytes |
|---|---|---|---|---|
| DOS / 437 | ? | QUESTION MARK | U+003F | 0x3F |
| DOS / 720 | ? | QUESTION MARK | U+003F | 0x3F |
| DOS / 737 | ? | QUESTION MARK | U+003F | 0x3F |
| DOS / 850 | ? | QUESTION MARK | U+003F | 0x3F |
| DOS / 852 | ? | QUESTION MARK | U+003F | 0x3F |
| DOS / 855 | ? | QUESTION MARK | U+003F | 0x3F |
| DOS / 858 | ? | QUESTION MARK | U+003F | 0x3F |
| DOS / 866 | ? | QUESTION MARK | U+003F | 0x3F |
| DOS / 869 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-1 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-10 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-11 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-13 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-14 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-15 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-16 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-2 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-3 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-4 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-5 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-6 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-7 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-8 | ? | QUESTION MARK | U+003F | 0x3F |
| ISO/IEC / ISO-8859-9 | ? | QUESTION MARK | U+003F | 0x3F |
| Windows / Windows-1250 | ? | QUESTION MARK | U+003F | 0x3F |
| Windows / Windows-1251 | ? | QUESTION MARK | U+003F | 0x3F |
| Windows / Windows-1252 | ? | QUESTION MARK | U+003F | 0x3F |
| Windows / Windows-1253 | ? | QUESTION MARK | U+003F | 0x3F |
| Windows / Windows-1254 | ? | QUESTION MARK | U+003F | 0x3F |
| Windows / Windows-1255 | ? | QUESTION MARK | U+003F | 0x3F |
| Windows / Windows-1256 | ? | QUESTION MARK | U+003F | 0x3F |
| Windows / Windows-1257 | ? | QUESTION MARK | U+003F | 0x3F |
| Windows / Windows-1258 | ? | QUESTION MARK | U+003F | 0x3F |