0x91

0x91 is a hexadecimal value that represents the byte with decimal value 145. In computing, it frequently appears in raw data, hex literals, and discussions of data encoding.

In Unicode, interpreting 0x91 as a code point yields U+0091, which is in the C1 control block. This is a non-printable control character, and in ordinary text it does not correspond to a visible symbol. The practical meaning of 0x91 in Unicode depends on the encoding or protocol used to map bytes to characters.

In Windows-1252 (CP1252), a common single-byte encoding on Windows systems for Western languages, the byte 0x91 maps to the left single quotation mark ‘ (U+2018). By contrast, 0x93 maps to the left double quotation mark “ (U+201C), and 0x92 maps to the right single quotation mark ’. In ISO-8859-1 (Latin-1), 0x91 is treated as a control code rather than a printable character.

Because the meaning of 0x91 is encoding-dependent, its interpretation can vary between contexts. Raw byte values like 0x91 must be interpreted against the specific encoding or protocol in use; otherwise, they may yield different characters or non-printable control actions when displayed or processed.

See also: Byte, Hexadecimal, Unicode, Windows-1252, Character encoding, Data encoding.