Definitions for "Fragment identifier"
Keywords:  uri, mdash, rfc, url, spec
an optional part of a URL that is used to specify a particular location within a Web page
That part of a URL that appears after the # symbol. It points to an internal location within the resource.
A portion of a [ URI] as defined in RFC 3986.
the portion of an HREF attribute value following the `#' character which modifies the presentation of the destination of a hyperlink.
A text string included using a NAME attribute in an A element, that labels the anchored location in a document--thus the word fragment, since it references a document fragment.