A related question:
In the systemview screen and also in other areas where atmosphere is described, sometimes some components get a (F) behind them.
What does this signify?
F-luid would be strange, as water vapour certainly would be mentioned on Earth if this were so.
My best guess would be that it signifies it being toxic (at current concentration) or -less likely- it having a cooling effect (Freon/Frigid).
I just realized another meaning could be F-rozen, as I also see this (F) for nitrogen, but mainly at planets that are very cryogenic. Though, at -230C Nitrogen should be liquid IIRC.