Seriously.
Seriously.


Seriously.
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Never heard about °R and °RA before this meme
It's the Rankine. Some Scottish dude wanted to use Kelvin without using Kelvin. It's basically the Fahrenheit scale but with 0˚R set at absolute zero.
0˚R = 0K
and 1˚R = 0K + 1˚F
From what I can gather, R and Ra are the same thing?
They are. The post could swap one of them out for Re or Rø instead and it would work, though
https://en.wikipedia.org/wiki/R%C3%A9aumur_scale
so, they meant °r probably
https://byjus.com/physics/unit-of-temperature/
I had to look out up too!
Now look into °De. It's upside down!
https://en.wikipedia.org/wiki/Delisle_scale
Why would you do this to me?