Zhubov scale
Encyclopedia
The Zhubov scale is a way of reporting polar
Polar region
Earth's polar regions are the areas of the globe surrounding the poles also known as frigid zones. The North Pole and South Pole being the centers, these regions are dominated by the polar ice caps, resting respectively on the Arctic Ocean and the continent of Antarctica...

 sea ice coverage, it was developed in the former USSR by Russian naval officer N. N. Zhubov (1895 - 1960).

The Zhubov scale is measured using the unit ball, one ball equals 10% coverage, five balls 50% coverage and so on.
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