What is the command/package used to give the Inverted exclamation mark in Mathmode. I have tried the following:
\mbox{!`}_A - The output is not at the same margin level as !.
\mbox{\textexclamdown}_A - The output is again not at the same margin level as !.
\rotatebox[origin=c]{180}{!}_A - The output is at the same margin, and this is what is required. However, I find this too complex for a simple inverted exclamation mark.
Best Answer
Taking code from https://tex.stackexchange.com/a/312530/4427, here is a version that raises the inverted exclamation mark to sit on the baseline.
You might want to use
\mathord
instead of\mathclose
throughout, if your symbols are to denote objects of a category. Or, better, define semantic commands.