The term "Hindu" derives from the name of the Indus River, called Sindhu. Originally it referred to the people living near the Indus River, but during Muslim rule it came to refer to non-Muslims in the region. By the 18th century, it specifically referred to the religion. Hinduism is not only a religion but also a culture and way of life encompassing spiritual paths, liberation from cycles of rebirth, and practices like planting trees, sculpture, singing, architecture, dancing, archery, medicine, and astrology. The Upanishads, composed around 600 BCE, compiled the religious stories of Hindu faith and were originally written in the Tamil language, speaking of the supreme being Brahman