Is there a symbol that is used to stand for completions 1...n

Is there a symbol that is used to stand for completions 1…n in the technical literature? I.e. if you are considering five alternate completions, Xsub1, Xsub2, etc., would there be a particular greek character that was used for X?

I am trying to choose a “dingbat” for a book design.

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Good question. We will need to establish entirely new lingo and standards for these new technologies. I’ll go digging through some unicode symbols to see what looks good.

EDIT: Probably the math symbol for “element” as in “element of set”: ∈

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I am thinking specifically about the mathematical modeling that we see in the highly technical papers about reinforcement learning. when a scientist is mathematically describing what a model like GPT-3 does, what symbols does she use to describe the part of the process where completions are generated and evaluated?

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