one should not increase, beyond what is necessary,
the number of entities required to explain anything
Occam's Razor is a principle of logic. Well, that explains why I'd never heard of it. Logic and I do not have a relationship. I'm a go with the flow, intuitive leaping kind of thinker...when I think. It is the basis for scientific modeling and theory building. It is associated with a guy from medieval times named, you guessed it, William of Occam. I'm taking a leap here, as I am wont to do, and guessing the razor references the cutting away of extraneous junk which muddies the waters when attempting to compose an explanation for something. Hmm, there you go, now the day is not wasted because we've learned something. Someday this bit of trivia may win someone money on Jeopardy! or...or...a radio call in program. You just never know. Wonder what that principle is called? Uh oh...now I'm going to have to do another internet search.
Update: In quantum physics, the Heisenberg uncertainty principle states that one cannot assign with full precision values for certain pairs of observable variables, including the position and momentum, of a single particle at the same time even in theory. I looked it up, I shared it with you, I'm stopping now. This isn't Numbers after all.