Class R was a planetary classification for a type of terrestrial planet. For large-scale excavations on the surface of these planets, the Federation used the fissionable explosive plutonium ryanite. (TNG: "Night Terrors")

For the remastered episode "Night Terrors", the list of explosives was revised. This classification was mentioned in one of the new entries.
According to Star Trek: Star Charts (p. 28), class R denoted a rogue planet. Dakala was listed as an example.

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