I'm trying to create a symbol \diffeo for "diffeomorphic" and \isomet for "isometric".

I'd like it to look exactly like \approx $\approx$, but with three lines for the first one; and three lines with the middle being straight for the second one:

enter image description here enter image description here

where approx is the symbol

enter image description here.


The first of the following macros is in the Comprehensive List of LaTeX Symbols (texdoc symbols, with TeX Live), where it is called \threesim; the second one has been built similarly.


  • I've searched Latex comprehensive symbol list before, but never found those two symbols. Don't know why they didn't add them as a built-in control and add a picture of it. I also checked Detexify (detexify.kirelabs.org/classify.html), but never got any suggestions. Thank you very much.
    – Leo
    Jul 2 '11 at 20:15
  • 3
    It's on page 104, but I admit that I know where to look even without remembering the command's name. ;-) I built the second one just now.
    – egreg
    Jul 2 '11 at 20:21
  • 10 years later it's on page 261 :) is it correct that this symbol is not part of LaTeX itself or any package, so the definition needs to be copied in order to use the symbol? Maybe a package can be found that is willing to "host" it?
    – Marijn
    Sep 24 at 12:44
  • @Marijn The code is free for use by anybody.
    – egreg
    Sep 24 at 13:30

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