"360 Link" is the trademark name of a service we use to link users to full text that might be available in places other than the database you are using.
Put simply, if the database you're using doesn't have the full-text of the article, "360 Link" will go looking for the article full-text in other databases for you.
If there is no full text available from any of IUP's databases, "360 Link" will tell you that and will also give you links that search the title in the Library Catalog or request the article through Inter-Library Loan.