CJ's were followed by the YJ, which some say stood for Yuppie Jeep, they are identifiable by the square headlights.
After the YJ came the TJ, returned to round (correct in my opinion) headlights and got away from leaf spring suspension. Time frame on the TJ was from 97 until 2007 when it was replaced with the new model, the JK.
Also, you may see references made to an LJ, that is the code for the extended wheelbase Unlimited model TJ's. Hope this helps!!