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Alpha Rho Epsilon? Alpha Pee Epsilon? Google isn't helping me here...

I think they're referring to this:

One of many HN discussions about the topic here:

Thank you! When I encounter an unknown term on HN, I try to find out for myself what it is before bugging everyone, but it doesn't always work.

Yup! Besides being hard to search, others have commented that the name might be bad for accessibility: