Twin vs Kurgan

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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

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A kurgan (Russian: курга́н) is a type of tumulus constructed over a grave, often characterized by containing a single human body along with grave vessels, weapons and horses. Originally in use on the Pontic-Caspian steppe, kurgans spread into much of Central Asia and Eastern, Southeast, Western and Northern Europe during the 3rd millennium BC.The Russian noun, already attested in Old East Slavic, comes from an unidentified Turkic language, compare Modern Turkish kurğan, which means "fortress". Kurgans are mounds of earth and stones raised over a grave or graves. Popularised by its use in Soviet archaeology, the word is now widely used for tumuli in the context of Eastern European and Central Asian archaeology.

The earliest kurgans date to the 4th millennium BC in the Caucasus, and researchers associate these with the Indo-Europeans. Kurgans were built in the Eneolithic, Bronze, Iron, Antiquity and Middle Ages, with ancient traditions still active in Southern Siberia and Central Asia. Archeologists divide kurgan cultures into different sub-cultures, such as Timber Grave, Pit Grave, Scythian, Sarmatian, Hunnish and Kuman-Kipchak. Many placenames contain the word kurgan.

Source: Wikipedia