Desktop User Guides > Reporter > Reference > Table specification syntax > Naming conventions
Naming conventions
Names of variables, categories and other elements of a variable, and filters must conform to the following rules:
1 The first character must be a letter or _ (underscore).
2 Subsequent characters can be:
digits from either Basic Latin or other national languages
@, $, #, or _ symbols.
3 Embedded spaces and special characters are not allowed.
A letter is any English letter character (a-z, A-Z) or an alphabetical character from another language.
Reserved words
See Keyword summary.
See also
Table specification syntax