Permille

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v • d • e Punctuation
apostrophe ( ', ’ ) brackets ( ), [ ], { }, < > colon ( : ) comma ( , ) dashes ( ‒, –, —, ― ) ellipsis ( …, ... ) exclamation mark ( ! ) full stop/period ( . ) guillemets ( « » ) hyphen ( -, ‐ ) interpunct ( · ) question mark ( ? ) quotation marks ( ", ‘ ’, “ ” ) semicolon ( ; ) slash/solidus/stroke ( / )
Interword separation
spaces ( ) ( ) ( )
General typography
ampersand ( & ) asterisk ( * ) at ( @ ) backslash ( \ ) bullet ( • ) caret ( ^ ) currency ( ¤ ) ¢, $, €, £, ¥ dagger ( † ) ( ‡ ) degree ( ° ) inverted exclamation point ( ¡ ) inverted question mark ( ¿ ) number sign ( # ) percent and related signs ( %, ‰, ‱ ) pilcrow ( ¶ ) prime ( ′ ) section sign ( § ) tilde ( ~ ) umlaut/diaeresis ( ¨ ) underscore/understrike ( _ ) vertical/pipe/broken bar ( \|, ¦ )
Uncommon typography
asterism ( ⁂ ) lozenge ( ◊ ) interrobang ( ‽ ) irony mark ( ؟ ) reference mark ( ※ ) sarcasm mark

A permille or per mille (literally meaning 'per thousand') is a tenth of a percent or one part per thousand. It is written with the sign ‰ (Unicode U+2030)., which looks like a percent sign (%) with an extra ₀ at the end. It is a stylized form of the three zeros in the denominator.

1‰ = 10^-3.

For instance, 5‰ = 5/1000 = 0.005 = 0.5%

[edit] Examples

Examples of common use are:

Blood alcohol content
Seawater salinity. Eg "the average salinity is 35‰".
Tunnel gradients
Birth and death rates.
When used to describe property taxation in the U.S., it is called the millage rate.