|In Unicode||U+2030 ‰ PER MILLE SIGN (‰)|
|See also||U+0025 % PERCENT SIGN|
U+2031 ‱ PER TEN THOUSAND SIGN (Basis point)
Per mille (from Latin per mīlle 'in each thousand') is parts per thousand. Other recognised spellings include per mil, per mill, permil, permill, or permille.
The associated sign is written, which looks like a per cent sign with an extra zero or o in the divisor.
Major dictionaries do not agree on the spelling and some dictionaries, such as Macmillan, do not even contain an entry. One common usage is blood alcohol content, which is usually expressed as a percentage in English-speaking countries.
Per mille should not be confused with parts per million (ppm).
The code point for the glyph is included in the General Punctuation block of Unicode characters: U+2030 ‰ PER MILLE SIGN. It may be typed using Alt+0137, Compose%o, Ctrl+⇧ Shift+u 2030, or ⌥ Option+⇧ Shift+r according to operating system.
Note that for the compose key sequence the percent key (%) is followed by lower case letter o and not, as might be expected, by digit 0.
Examples of use include:
per mille adverb (also per mil)