@snailcar Hi! Would you be willing to take a look at this answer - english.stackexchange.com/a/3126/300322 - I have a feeling this is wrong!

According to the Cambridge Dictionary, the plural of index is indices when index is used to mean "a sign or measure of something" (like price index/CPI index) and indexes when index is used to mean "an alphabetical list that shows you where information is found in a book, on a website, etc."

No effort in writing the question. God!

I'm not sure what you think is wrong about that answer. When talking about a table or an array of items, the plural of index is indices. Look it up in the LDOCE.

I looked it up in Cambridge - it says the plural of index is indexes when it is used to mean directories (tables/lists/info). The answer does not make that distinction.

Is "to complete a form" idiomatic, or should we always use "fill out/in a form"?

indices sounds Latin?

like formulae

imho

@userr2684291 Eh, whom uses that anymore, ser?

@snailcar Thanks for taking a look at it. You explained it perfectly - I apologize for using "wrong" - but incomplete and misleading. What struck me was that it got 67 upvotes - I would expect that many votes on a top quality answer. And yes, it depends on what "technical" means. Even in a technical paper - one can have multiple inequality measures (indices) and then several directories (indexes).