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> You're probably right.  But what about the "i" in "ipairs"?
> Which of the following did it come from?
> - the word "integer"
> - the word "indexed" (or "index")
> - the identifier "i" traditionally used in numeric loops
>  (regardless of the source of that tradition)
> I realized it may be "a bit of each", but was there a
> primary source?

The last. The origin of this "i" in Lua was in Lua 3.?, which got two
interator functions: foreach and foreachi.

-- Roberto