406 may refer to any of the following:
406 is an HTTP status code for an unacceptable request. Often, it is returned when the user’s browser requests information from the server using an “Accept-” header, such as “Accept-Charset” or “Accept-Language.” If the server cannot fulfill the request, it returns the 406 code to indicate failure.
406 is a US area code, see our 406 area code listing for further information.
Error, Header, HTTP, Web design terms
