What does "jt2" mean?

Looking up a vin on jaguarusa.com gives this model identification:

2005 x-type 3.0 petrol jt2 saloon

What does the jt2 mean?

Found this for the 2010 XJ:

Luxury JT2
Premium Luxury JT3
Supersport JT4
Portfolio JT5
Super Luxury JT6

Body codes for the X-type:

|51|4 Door High Series
|52|4 Door Entry Series
|53|4 Door Sport Series
|54|4 Door High Series Estate
|55|4 Door Entry Series Estate
|56|4 Door Sport Series Estate

The car I was looking up was a 51 (4 Door High Series).