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xkcd #2943: Unsolved Chemistry Problems
(imgs.xkcd.com)
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I'm an H⁺ denier, in that I refuse to consider loose protons to be real hydrogen, so I personally believe it stands for 'pretend'.
Can the term potency also be used to refer to the exponent in English? Because that is what is meant by the terms in the other languages and I haven't come across that usage of the word potency in English
I think that's accurate, the exponent is what it's referring to, but the pedantic types are worried about what the p literally means.