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The current ARC placeholder suggestion is RV32CH/RV64CH and that's what I've used in #566.
However, multiple characters are a bit odd.
Looking at the misa letters that are marked as reserved in the priv spec I see G, J, K, L, O, R, T, W, Y, Z.
I don't think G, J, and Z can be used so maybe one of the following could work:
- K (for Kapability): probably not since that is used for most Kryptography extensions,
- L (for Longer pointers)
- R (for Restricted pointers or Really-secure)
- T (somewhat contrived: Tightly-bounded pointers)
- Y (for capabilitY)
- W (for Wider pointers)
Can't think of any name with O, but if needed I'm sure we can come up with something.