Siddhaṃ is an Indic script used in India from the 6th century to the 13th century. Also known in its later evolved form as Siddhamātṛkā, Siddham is a medieval Brahmic abugida, derived from the Gupta script and ancestral to the Nāgarī, Eastern Nagari, Tirhuta, Odia and Nepalese scripts. The Siddham script was widely used by Indian Buddhists and still remains in use by East Asian Buddhists, especially for writing mantras, seed syllables, and dharanis.