OK, I will now show the level of my ignorance. (someone has to do it.)

My first thought was "Ah, the characters 'CP1' exist in one instance and not in the other."

So, I looked carefully for some explanation of what 'CP1' stood for. If it is in the article I missed it despite re-reading several times.

Apparently completely unimportant as far as the article is concerned, but just what does the 'CP1' stand for?