x1F

x1F is a notation commonly encountered in computing to denote the hexadecimal value 1F, usually represented as 0x1F in many programming languages. The string or symbol “x1F” may appear in informal notes, hex dumps, or documentation to indicate a byte with value 0x1F, though the canonical syntax is 0x1F.

In ASCII, the byte 0x1F is a control character, historically known as the Unit Separator. In Unicode it is assigned the code point U+001F and is officially named Information Separator One (US-1). It is a non-printable character and has no visible glyph, and it is typically used in data streams as a delimiter or control marker according to specific protocols.

When text is encoded in UTF-8, the code point U+001F is encoded as the single byte 0x1F, so the same value may appear within UTF-8 encoded data. In source code, languages support escape sequences such as \x1F or \u001F to embed this character in strings.

Because x1F is not a standardized identifier, its meaning is determined entirely by context: the surrounding data format, protocol, or programming language. It is not associated with a specific widely adopted standard, product, or service on its own.

See also: ASCII control characters; Unicode code points; hexadecimal notation; escape sequences in programming.