I don't think there actually are, in the sense that there isn't a register somewhere with these values that gets compared against, the way there is with rings 0-3. I've only heard this in the context of reverse engineers describing the layers of access that undocumented parts of a modern CPU system have, I think it's just a made-up analogy. There is presumably some proprietary documentation out there with more official names.
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I don't think there actually are, in the sense that there isn't a register somewhere with these values that gets compared against, the way there is with rings 0-3. I've only heard this in the context of reverse engineers describing the layers of access that undocumented parts of a modern CPU system have, I think it's just a made-up analogy. There is presumably some proprietary documentation out there with more official names.