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The swastika is an equilateral cross with four arms bent at 90 degrees. The earliest archaeological evidence of swastika-shaped ornaments dates back to the Indus Valley Civilization, Ancient India as well as Classical Antiquity.
The word "swastika" comes from the Sanskrit svastika - "su" meaning "good" or "auspicious.
Hitler stole the Buddhism symbol, but he was using the symbols differently. In Buddhism, the swastika is put flat and not in black color, but the Nazi put the swastika's corner pointing upwards and made it black.