#:

... the number symbol as a tagging device used in the creation of a webpage. It's an element of HTML which, according towww.w3schools.com/TAGS/att_ins_cite.asp, points to a named anchor. Here the definition of anchor is as follows: A ... starting point or ending point of a hyperlink (source). Microsoft's HTML editor refers to a named anchor as a bookmark. FrontPage places a linked bookmark within a webpage. Adobe Dreamweaver is another example of an editor. It uses named anchor and anchor. In either case and with various other HTML editors, the #-tag is a pointer. See the #-tag ending the following URL address string.

http://www.w3.org/People/Berners-Lee/Weaving/glossary.html#link

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FYI: # is an adjunct function that goes along with the creation of an HTML anchor. It is a marker in the code of a webpage having a position relative to a named anchor or bookmark. It is assigned as a hyperlink to a particular anchor or bookmark.