What or field is it related to (e.g., finance, engineering, software)? Where did you first see the name?

If you were looking for a specific or report that you believe is named "NAN2R", could you clarify:

It is part of the binary-to-text encoding used to include images, PDFs, or other non-text attachments within a plain text filing.

If you are looking for the actual information contained in the filing that includes this string, you can search the SEC EDGAR database using the company's or the specific Accession Number (e.g., 0001144204-15-029804) found in the search results.