Zhubov scale
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The Zhubov scale is a way of reporting polar sea ice coverage.[1][2]
It was developed in the former USSR by Russian naval officer N. N. Zhubov (1895–1960) as a way for Soviet officers to describe ice coverage.[3][4]
The Zhubov scale is measured by using the unit ball, one ball equals 10% coverage, five balls 50% coverage and so on, with a total of ten unit balls being possible.[4][2]