\nnn may refer to:

• \NNN (octal), representation of literals (such as characters) as octal numbers 1 to 3 digits (common)
• \nnn (decimal), representation of characters as decimal numbers (rare)
• TIO code, trigraph representation of characters as decimal numbers in Hewlett-Packard palmtops

• \n
• nnn (disambiguation)
• \xnn (hexadecimal)

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