Ruda Śląska vs Twin

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Ruda Śląska [ˈruda ˈɕlɔ̃ska] (listen) (German: Ruda O.S.; Silesian: Ślōnsko Ruda) is a city in Silesia in southern Poland, near Katowice. It is a district in the Upper Silesian Metropolitan Union, a metropolis with a population of two million. It is in the Silesian Highlands, on the Kłodnica River (tributary of the Oder). It has been part of the Silesian Voivodeship since its formation in 1999.

Previously, it was in Katowice Voivodeship, and before then, part of the Autonomous Silesian Voivodeship. Ruda Śląska is one of the cities in the Katowice urban area (population 2.7 million) and within the greater Silesian metropolitan area (population 5,294,000). The population of the city is 137,360 (December 2019).

Source: Wikipedia

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Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

In contrast, a fetus that develops alone in the womb (the much more common case, in humans) is called a singleton, and the general term for one offspring of a multiple birth is a multiple. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgangers.

Source: Wikipedia