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Maybe over there, they use it to give temperature differences a proper unit. Where we use Kelvin, they probably use degree Rankine.
Over where? Here in the US, where I am? Even as an American I think that shit is ridiculous.
It's just a guess. My thermodynamics lecturer at least became furious when somebody used °C instead of K for expressing temperature differences.
A thermodynamics lecturer in the US would want people to use K (not °R!) too.
I thought everything is done in freedom units over there.
Nope, a lot of consumer/general-public stuff is in freedom units (we buy milk in gallons but soda in liters, for example), but science is all metric and engineering is mostly metric (the exception is civil engineering).
Speaking of which, that's not as different from the rest of the world as you might think: ever wonder why 13mm is a suspiciously common size for things like bolt heads and plywood thicknesses? It's because they're secretly 1/2"!