Either you a troll with his head stuck up his ass or not very much enlightened.
Product name:
225/40/18" Pirelli Tyres
Part number:
Part No. 225/40/18P (Autostyler website)
Otherwise an optional letter (or letters) indicating the intended use or vehicle class for the tire:
P: Passenger Car
LT: Light Truck
ST: Special Trailer
T: Temporary (restricted usage for "Space-Saver" spare wheels)
Exampe: P indicates that the tire is engineered to TRA standards and absence of a letter indicates that the tire is engineered to ETRTO standards. In practice, the standards of the two organizations have evolved together and are fairly interchangeable, but not fully since the Load Index will be different for the same size tire.
Your own link:
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35
This is really wow, other people also read this thread.
BTW, the only reason that Autostyler will possibly advise an P rated tyre is due to your vehicle being incapable to exceed 150 Km/h (94 Mph), this according to the national regulations set by the European Tyre and Rim Technical Organisation (ETRTO) and the Tire and Rim Association (TRA).