I needed the LaTeX code for the sign that is called the "promille" sign in Dutch. It's the sign like the percent sign "%" ("procent" in Dutch), but with two circles at the bottom. Googling for "latex promille" was not very successful, so I thought this would be a good botsnack. (Googling for "permille" or "(parts) per thousand", yield better results however.)

Anyway, I found two solutions:

  • \textperthousand from the package textcomp, also provides \textpertenthousand but both only work in text mode, not in math mode.
  • \permil from the package wasysym, works in both text mode as in math mode.

That's all folks