ASCII 92 — \

The backslash (reverse solidus) is the universal escape character in programming languages and regular expressions. In string literals, '\n' means newline, '\t' means tab, and '\\' represents a literal backslash. Windows uses backslash as the file path separator, diverging from Unix's forward slash — a platform inconsistency that has generated countless cross-platform bugs. In regular expressions, backslash escapes metacharacters so they match literally. In LaTeX, backslash introduces all commands and macros. The backslash's role as the escape prefix makes it indispensable throughout computing.

Symbol characters in ASCII include mathematical operators, logical notation, and special-purpose marks that serve critical roles across programming, mathematics, and digital communication. Symbols are heavily context-dependent — the same character may act as an arithmetic operator in one language, a regex metacharacter in another, and a shell configuration flag in a third context. This contextual polyvalence makes symbols among the most functionally overloaded characters in computing, requiring careful attention to their meaning in each domain.

In the ASCII encoding table, Backslash is assigned code point 92 in decimal (0x5C hexadecimal, 134 octal, 01011100 binary). The 7-bit ASCII standard, first published in 1963 by the American Standards Association, defines exactly 128 characters that remain the foundation of text encoding systems worldwide. UTF-8, the dominant encoding on the modern web, is fully backward compatible with ASCII — every ASCII character is encoded as the identical single byte in UTF-8, guaranteeing that Backslash works reliably across all operating systems, programming languages, and internet protocols.