Contributor(s): Andrew Dunford and others.
  Now the 11th out is pretty ambigious. It is not listed with 
  the other outs but can be found in the law dealing with 
  substitions (Law 2)

  In general, any batsman who refuses to bat when he is able 
  to do so or is refused permission to bat by the opposing 
  captain (he had left the field when he was able to bat on) 
  is for the purpose of the records deemed to be "retired, out". 

Some parts © 2009 Advameg, Inc.