What does it mean when a college says that their early action isn't restricting?
With so many types of ways to apply, it can be confusing.
Early action is when you can apply early and find out your results early. If you are accepted early action, then you are accepted, but are not committed to attending that university, like early decision.
Restricted early action means what I said above, but you can only apply to other early action programs. You are not allowed to apply to any early decision programs, since they are binding (require you to attend if admitted). Georgetown University is an example of a restricted early action.
Unrestricted early action means that you can apply for other schools early action and early decision. They are not limiting you from applying to other schools early.