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It means it's rated for +p ammunition. +P ammunition is a little bit higher of a velocity and pressure than standard ammo, most modern firearms can handle +p ammo but not all. Usually only defense ammo is +p rated and manufacturers recommend limited use of it cause it can wear out parts of the firearm quicker than standard pressure ammo. Hope this helps.

Alan, +P is a designation for higher Pressure Ammunition than standard SAAMI Pressure Ammunition. Details here : https://en.wikipedia.org/wiki/Overpressure_ammunition

If you are referring to the P in JHP its for a Polymer IE Polymer frame if you mean the +p its rated for the hotter +p 45acp ammo