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    At the top of the file define: \newcommand{\ind}{\perp\!\!\!\!\perp} Commented Dec 6, 2018 at 9:50
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    Simple and highly effective, and doesn't require packages that change other symbols. My favorite answer here! Commented Apr 18, 2019 at 15:16
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    This is a nice answer, but I found that the two $\perp$ symbols can become separated if they are right at the point of a line break! The fix is to make it a math atom: $\newcommand{\ind}{{\perp\!\!\!\perp}}$ Commented Mar 10, 2020 at 5:40
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    @aaronsnoswell I think that messes up the spacing, so I use \newcommand{\ind}{\mathrel{\perp\!\!\!\perp}}. Commented Jul 6, 2022 at 21:00