Does anybody know what symbol to put above an inequality symbol < to indicate that the triangle inequality has been applied?

I would like a symbol like this (which is not in The Comprehensive Latex Symbol List)

doesnt work

And I tried the following


but the two lines are not parallel:

doesnt work

Does anybody know how to somehow rotate the line to the correct angle? Any help is appreciated!

  • First, search ctan.org/tex-archive/info/symbols/comprehensive Mar 28, 2015 at 14:56
  • Do you use the triangle inequality so many times that you need a special symbol instead of simply adding the words? Such stenography is not really useful, in my opinion.
    – egreg
    Mar 28, 2015 at 14:56
  • @egreg Yes, actually I do :). I don't like writing 'the triangle inequality' everywhere, but I really need to somehow show that it is being used.
    – Carucel
    Mar 28, 2015 at 14:59
  • 2
    Try \mathrel{\ooalign{\hidewidth$\triangle$\hidewidth\cr\rotatebox[origin=c]{-9}{$/$}\cr}}.
    – user11232
    Mar 28, 2015 at 15:01
  • @HarishKumar Your solution works as well, thank you!
    – Carucel
    Mar 28, 2015 at 15:05

1 Answer 1


Here is a tikz picture

enter image description here

\draw (0,0) -- (4,0) -- (2,3.46410161514) -- cycle;
\draw [domain=1:3.4] plot(\x,{(5.6-3.46410161514*\x)/-2});
$\mathrel{\triangle\!\!\!\!/}$ test \trineg\ test $\trineg $

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