When assigning a character value or embedding a character in a string, certain characters are hard to represent. For those, a backslash (\) starts an "escaped" sequence of characters with special meaning:
\"
= double quote inside a string
\\
= backslash
\n
= line feed
\t
= tab
\'
= single quote
\r
= carriage return
\f
= form feed (new page)
\uxxxx
where xxxx are 4 hexadecimal digits = unicode character
Some examples of Unicode characters:
\u00a9
= ©
\u20ac
= €
\u2191
= ↑
\u2192
= →