" Double quotation mark
' Single quotation mark
{} Curly brackets
[] Square brackets
- minus
_ Underscore
# Number sign
% Percent sign
& Ampersand
Euro sign
$ Dollar sign
£ Pound sign
² Exponents (0 - 9)

If you wish to use special characters within your survey that are not included in this list, you can include them manually after the conversion in your questionnaire.tex file.