You shouldn't use "PoS" to refer to Proof of Service as that abbreviation usually means Proof of Stake. Using "PoS" is misleading and provokes misunderstanding of DRKs features. Proof of Stake is a block generation mechanism which Proof of Service isn't. They are totally different things and shouldn't be mixed up.

I suggest using "PoSVC" or just not abbreviate it at all.