DOUBLE LATEX FUTON 80 X NATURAL - Latex double
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If you only want then occasionally, perhaps you can just roll-your-own by using a little bit of negative space, like this. Maths in double brackets $[\![ e=mc^2 ]\!]$ or. A variation on my answer here: double tilde symbol under letter. Here, \tsup takes an optional argument specifying the number of symbols to.