When did the kings of egypt begin to be called pharaoh?

The word came to be used metonymically for the Egyptian king under the New Kingdom (starting in the 18th dynasty, 1539–1292 bce), and by the 22nd dynasty (c. 945–c. 730 bce) it had been adopted as an epithet of respect.

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map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.