In this case, since the name is itself a quasi-acronym, all-uppercase is fine.

I normally use all_lowercase for local variables, CapitalizedCamelCase for global variables, and ALL_UPPERCASE for constants, but very short names can end up all uppercase as well, if that seems to make sense in context. In your case, since you are "following suit" with a feature of another package, I say that "UC" makes sense in context.

In reply to Re: when to capitalize package variables by jcb
in thread when to capitalize package variables by Lotus1

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