It's a percent sign with an extra 'o' at the bottom. It means 'per thousand', rather than 'per hundred'.
5% of 400 is 20, therefore, 5‰ of 400 is 2.
by Bob Gurch August 27, 2004
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Gurch

Any member of the Church family.

(Numerous exceptions include Charlotte Church and the Roman Catholic Church).

Many have a tendency to say "Gah" a lot.
Gah! It's Gurch!
by Bob Gurch May 25, 2004
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·

The · is a dot. A bit like the full stop (.), but higher up. Used as a shorthand for 'multiply' in mathematics (because they don't want to get × confused with x).
Equation: 5x² · 2y = 10x²y
by Bob Gurch August 27, 2004
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¬

One of the least used symbols on the keyboard.
When did you last press the ¬ key? Come on, seriously... have you ever pressed it at all except once to see what it did?
by Bob Gurch August 26, 2004
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