Zhubov scale

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Scale for measuring ice coverage, developed in the former USSR. The unit is the ball; one ball is 10% coverage, two balls 20%, and so on.

Blue stands for faith and loyalty, the sea, lakes, and the sky. Black represents past suffering and is the colour of the traditional peasant's jacket. White symbolizes virtue and enlightenment and is the colour of snow, birch bark, and the midnight sun. Effective date: 16 November 1990. >>