Permille (also written "permill", "per mil", and other variations) represents a portion of a whole in parts per 1000, just as percent represents parts per 100.
It is denoted by the symbol ‰ (like the percent sign, but with an additional zero under the slash).
Thus:
- 1,000‰ ≡ 1,000 per 1,000 = 1 or 100%
- 100‰ ≡ 100 per 1,000 = 1/10 or 10%
- 10‰ ≡ 10 per 1,000 = 1/100 or 1%
- 1‰ ≡ 1 per 1,000 = 1/1000 or 0.1%
Note that 1 permille is 1/10 of 1 percent.