A variable name can have up to 32 characters, beginning with a letter or underscore, followed by letters, numbers or underscores, with no embedded blanks. Variable names are case-sensitive.

A variable name cannot be the same as a built-in function or constant, but may contain a reserved word as part of its name. For example, if "sin" is a built-in function, then "sin" is not a valid variable name, but "sin_of_x" is valid. Reserved names are not case sensitive, so "Sin" is not a valid variable name.

A variable's name must be unique within the cell or sub-design in which it is used.