Variable names

Variable names must meet the following rules:

• The first character is a lower case letter in the range [a-z], or an upper case letter in the range [A-Z].

• The subsequent characters are either lower case letters in the range [a-z], upper case letters in the range [A-Z], or numerals in the range [0-9].

• The name is not a reserved word included in the list of formula operators.

The following are examples of illegal names:

Illegal variable names