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My prefix is Polish
My postfix, just the opposite
My infix is easier to read
I can be anything you choose, but never, ever will I be a Tion.

What am I?

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1
  • 2
    $\begingroup$ Is this question due a green checkmark now? $\endgroup$
    – Stiv
    Commented Sep 14, 2019 at 17:47

1 Answer 1

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This figures out to be

notation

My prefix is Polish

Polish notation, aka prefix notation.

My postfix, just the opposite

Postfix notation is also called Reverse Polish Notation.

My infix is easier to read

Infix notation is easier to read for humans.

I can be anything you choose, but never, ever will I be a Tion.

You can select your own notation, but this is not a tion.

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  • $\begingroup$ I wanted to invert the whole thing, so please don't do that with the 4th spoiler block :-) (You are correct, of course) $\endgroup$
    – Bass
    Commented Jan 21, 2019 at 23:48
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    $\begingroup$ Oops, fixed that. Maybe a T ion is ${^3}{H^+}$. $\endgroup$
    – Tom
    Commented Jan 22, 2019 at 0:01
  • $\begingroup$ Oo, brilliant! Editing the question :-) (no cancel that, too contrived.) $\endgroup$
    – Bass
    Commented Jan 22, 2019 at 0:06
  • $\begingroup$ (It's a brilliant clue, but since the whole point is pretending to not be brilliant, it would probably defeat the purpose) $\endgroup$
    – Bass
    Commented Jan 22, 2019 at 0:15

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