What is kroone?

As an AI language model, I assume that you are referring to the currency of Estonia, which is known as the kroon.

The kroon was the official currency of Estonia from 1928 until it was replaced by the euro in 2011. The currency was divided into 100 senti and its symbol was KR.

During its existence, the kroon underwent several reforms and devaluations due to economic instability in Estonia. The last devaluation occurred in 1992, after the country gained independence from the Soviet Union.

Overall, the kroon was considered a stable and widely used currency among Estonians. However, the country ultimately decided to adopt the euro as its official currency to align with the rest of the European Union and to support its economic growth and stability.