The independence symbol in LaTeX

If two random variables and are independent of each other, it is common to write it as

It appears that there isn’t a built-in LaTeX command for . The reference below presents several possible ways to reproduce this symbol. My personal favorite is the following:

\newcommand{\indep}{\perp \!\!\! \perp}

You can then use the new command wherever you want the independence symbol, e.g. X \indep Y.

References:

1. StackExchange. double perpendicular symbol (for independence).