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golden share

n. A nominal share which is able to outvote all other shares in certain specified circumstances, often held by a government organization in a government company undergoing privatization and transformation into a stock company.

Wikipedia
Golden share

A golden share is a nominal share which is able to outvote all other shares in certain specified circumstances, often held by a government organization, in a government company undergoing the process of privatization and transformation into a stock-company.