The phrase "written permission" refers to a document that gives someone authorization or consent to do something. It is typically in written form and serves as evidence that an individual has been granted approval for a particular action, activity, or access. The written permission can be in the form of a letter, email, contract, or any other legally binding document that outlines the terms and conditions of the authorization. This phrase is commonly used when referring to activities such as using someone else's property, entering into an agreement with another party, accessing private information, or engaging in certain behaviors that require consent from others.