It's the new Wrangler model which is between a Sport and an SE. Apparently, it's a cheaper version of the Sport with only the most popular Sport options. When my girlfriend was shopping for a 2002 Wrangler, we saw a lot of X's which looked exactly like Sport's, same wheel/trim packages, but actually had a shorter list of overall options. On the other hand, we saw some X's which were loaded with options and very closely reseambled the Sport in terms of price.
Short answer, X gives you the flexibility to get the most popular Sport options at a lower price than an actual Sport.
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