If you are referring to a article or a document related to U.S. immigration, it likely pertains to Form I-539 , Application to Extend/Change Nonimmigrant Status .
This form is used by nonimmigrants to request an extension of their stay or to change to a different nonimmigrant status (e.g., from an F-1 student to an H-4 dependent). (539 KB)
In a technical sense, refers to a specific file size. If you are referring to a article or a document related to U