Where does the phrase "central example" come from?

I see. I just searched for "central example" on the Stanford Encyclopedia of Philosophy, and it pops up there in tons of results too. Although there still isn't e.g. a page called "Central Example".

Searching for the phrase on Reddit does turn up a disproportionate number of hits from /r/slatestarcodex. So not LW-exclusive, but maybe unusually common around here. Possibly traceable to Weak Men Are Superweapons:

What is the problem with statements like this?

First, they are meant to re-center a category. Remember, people think in terms of categories with central and noncentral members – a sparrow is a central bird, an ostrich a noncentral one. But if you live on the Ostrich World, which is inhabited only by ostriches, emus, and cassowaries, then probably an ostrich seems like a pretty central example of ‘bird’ and the first sparrow you see will be fantastically strange.

Right now most people’s central examples of religion are probably things like your local neighborhood church. If you’re American, it’s probably a bland Protestant denomination like the Episcopalians or something.

The guy whose central examples of religion are Pope Francis and the Dalai Lama is probably going to have a different perception of religion than the guy whose central examples are Torquemada and Fred Phelps. If you convert someone from the first kind of person to the second kind of person, you’ve gone most of the way to making them an atheist.