Special characters can be encoded using escape sequences:
Escape sequence | Unicode code point
--- | ---
\b | backspace (U+0008 BACKSPACE)
\f | form feed (U+000C FORM FEED)
\n | newline (U+000A LINE FEED; LF)
\r | carriage return (U+000D CARRIAGE RETURN; CR)
\t | tab (U+0009 CHARACTER TABULATION)
\v | vertical tab (U+000B LINE TABULATION)
\\\\ | backslash (U+005C REVERSE SOLIDUS)
\' | single quote (U+0027 APOSTROPHE)
\" | double quote (U+0022 QUOTATION MARK)
\0 | null character (U+0000 NULL)
\uXXXX …where XXXX is exactly 4 hex digits in the range 0000–FFFF; e.g., \u000A is the same as \n (LINE FEED); \u0021 is "!" | Unicode code point between U+0000 and U+FFFF (the Unicode Basic Multilingual Plane)
\u{X}…\u{XXXXXX} …where X…XXXXXX is 1–6 hex digits in the range 0–10FFFF; e.g., \u{A} is the same as \n (LINE FEED); \u{21} is "!" | Unicode code point between U+0000 and U+10FFFF (the entirety of Unicode)
\xXX …where XX is exactly 2 hex digits in the range 00–FF; e.g., \x0A is the same as \n (LINE FEED); \x21 is "!" | Unicode code point between U+0000 and U+00FF (the Basic Latin and Latin-1 Supplement blocks; equivalent to ISO-8859-1)