English: An illustration showing a hectare and an are, both represented by squares with sides of 10 metres. The symbol for the hectare is defined in the SI Brochure as "ha" so by implication, the symbol for the are is "a". (This is the symbol assigned by EU directive 80/181/EEC).
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http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse