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It took a minute for me to realize: since the y axis is on a log scale it is not possible to include Vista, XP, NT and the like.

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X is obviously 10. P is π misspelled so XP ≈ 31.4.

Well as long as we're taking this route:

NT = nT = nano-tera-(dimensionless) = 10^-9 * 10^9 = 1

If X is a roman numeral, then π must be a greek numeral. I'm not super familiar with greek numerals, but I have to assume that they are in some way compatible with roman numerals. Pi probably confused the greeks in the same way it confused the Indiana State Senate, so the greek numeral π must actually be 3. Therefore, Xπ is actually 13.

Edit: Ok I looked it up. Looks like π actually is a greek numeral (who knew?) with a value of 80. X would be 600. So it would actually be 680.

Rho looks like P, while Pi sounds like P. Apparently ρ (rho) = 100. I don't know which is better, just another possibility.

Also: "The expected return of a given policy (π) in reinforcement learning, denoted ρ^π"

...Unicode perversely has some greek letter superscripts but not π.

This has gone deliciously off the rails.

> y axis

x axis.

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