When referencing an object by script or when using it in a Link, the next cases must be delimited by brackets when used in an object's or Link's path:

•Contains any character that is not a letter (a-z | A-Z) when used as the first character of that path

•Contains any character that is not a letter (a-z | A-Z), a number (0-9), or an underscore (_) when used after the first character of that path