The first thing I found was a magnet that contained all 3 things, to my delight! This magnet from Sick on Sin is nerdy, has math (veggies > rotting flesh), and is related to veganism.
SCORE!
Upon further nerdery and searching I found a matching shirt from Sick On Sin, which I think is even nerdier, as you will be wearing it and displaying your dorkdum!
Every good nerd loves zombies, and Sick On Sin makes this super cute zombie pocket mirror!