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I remember that a lot of the semiconductor physics articles on Wikipedia used to suffer a lot from this problem. (I don't dare to check the current state. :) I remember "k" being particularly nasty, because usually it's just the Boltzmann constant, but sometimes it isn't.
I think that's because ppl are copying formulas from textbooks without fully understanding them (yet). I also remember the article for the Shockley equation describing the temperature dependency incorrectly bc the author didn't seem to understand I_s(T). But that's fixed now.
I_s = reverse bias saturation current T = temperature ;)
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