0x5B

0x5B is a hexadecimal value representing the decimal number 91. In ASCII and Unicode, the code point U+005B corresponds to the left square bracket character, denoted '['. This bracket is widely used in programming and data formats to begin lists, arrays, or to enclose subexpressions.

Encoding and representation: In UTF-8, ASCII characters are encoded in a single byte, so '[' is encoded as 0x5B. Therefore, the byte 0x5B represents the character '[' in many text encodings. In source code, 0x5B may appear as a hex literal, or as the actual character in strings or character constants. For example, in C or C++, 0x5B is the numeric value of the character '['.

Uses in computing and data formats: In JSON, the '[' character marks the start of an array. In many programming languages, it is used for indexing, slicing, or accessing elements of a collection. In regular expressions, an unescaped '[' begins a character class, so a literal literal bracket is typically escaped.

HTML and XML references: The '[' character can be represented in HTML as a numeric character reference [ or, in some cases, with the named entity [. In practice, most web content uses the literal character or escapes only when required by markup rules.

Summary: 0x5B is the hexadecimal code for the character '[' in ASCII and Unicode, with broad use across programming, data formats, and text encoding.