Its end looks like a navel, which is a bellybutton
A type of orange. Usally they are bigger then your standard orange.
This site has the answer: http://www.yourproduceman.com/news_may_9_05.html NAVEL ORANGES (Tuesday, May 10): This time of year, you can find some pretty dry Navel Oranges. In the produce industry,...
About 100 or 200
It isn't used for anything. It was the bit of a plant that connects to the tree or bush! :D Hope this helps.