Symbol 6, used only for uninsured (and underinsured) motorists coverage, insures owned autos subject to a compulsory uninsured motorists law, including autos that the named insured acquires ownership of during the policy period that are also subject to a compulsory uninsured motorists law.
If the named insured is not required to carry uninsured motorists coverage or can reject the coverage, another symbol 2, 3, 4, or 7 needs to be used to provide uninsured motorists coverage, if it is desired.