eight umpire signals in the game cricket
Since this is not my area of expertise, I searched Google under the key words "cricket umpire signals" to get these possible sources:
http://www.bartontowncc.co.uk/pages/page_7078/UmpireSignals.aspx
http://www.youtube.com/watch?v=n1sP-nypdY8
http://cloverdalecricketclub.com/wp-content/uploads/2009/04/umpire.jpg
There seem to be more than eight.
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.