• When you change a dimension symbol, the system updates any relations or family tables that use that symbol.

• Pattern symbols cannot be modified. If you must name the symbol, use a parameter and establish a relation, setting the pattern symbol to the appropriately named parameter.

• You cannot modify the name of a tolerance symbol. For example, if you have a dimension d0 with tolerances +p0 and +m0, you cannot modify the name of +p0 or +m0.