### Active Characters and Special Symbols in Text

The active characters'

# $% & \ ^ _ { } ~  have special purposes within LaTeX. Thus they cannot be produced in the final document simply by typing them directly. On the rare occasions when one needs to use the special characters #$ % & _ { }
in the final document, they can be produced by typing the control sequences
\# \\$ \% \& \_ \{ \}

respectively. However the characters \, ^ and ~ cannot be produced simply by preceding them with a backslash. They can however be produced using \char92 (in the \texttt font only), \char94 and \char126` respectively. (The decimal numbers 92, 94 and 126 are the ASCII codes of these characters.)

Other special symbols can be introduced into text using the appropriate control sequences: