Exclusionary link is a term used to describe a type of link that is not accessible to all users. It is usually used to refer to links that are only available to certain groups or individuals, such as members of a private organization or those with a specific level of access. This type of link can be used to restrict access to certain content or services, and is often used in the context of online security. NOR is an acronym for 'No Open Redirection, ' which is a security measure that prevents malicious actors from redirecting users to malicious websites.