0x89

0x89 is a hexadecimal numeric literal commonly used in programming to denote the integer value 137. In decimal form it equals 137, and in binary it is 10001001. As a single byte value, 0x89 appears in data streams and file formats that use hexadecimal notation.

In character encodings, 0x89 has different interpretations. It does not correspond to a printable ASCII character, since ASCII covers 0x00 through 0x7F. In ISO/IEC 8859-1 (Latin-1), 0x89 is a C1 control code. In Windows-1252, a widely used extension on Windows systems, 0x89 maps to the per mille sign (‰), U+2030. In UTF-8, a standalone 0x89 is not a valid starting byte; a code point such as U+0089 would be encoded as two bytes (0xC2 0x89).

A notable use of 0x89 is as the first byte of the PNG image file signature. The eight-byte sequence 89 50 4E 47 0D 0A 1A 0A identifies PNG files and helps distinguish binary image data from plain text, supporting quick format recognition and basic integrity checks.

In programming practice, 0x89 is used wherever hexadecimal literals express an 8-bit value. It can serve as a bitwise mask, a flag value, or part of a protocol constant, depending on the context and language.