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The ounce is the name for a number of different units of mass, and, confusingly, volume. See Imperial system of units and U.S. customary units for more about the frameworks within which these units are defined.


The Dutch term ons is a unit of mass that is considerably more, 100 grams.

There are also two versions of the fluid ounce, units of volume, of 28.4 and 29.6 ml.

The symbol for ounce is ℥

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Ounce is also another name for the snow leopard.