Overview
Sahasrāra (Sanskrit: सहस्रार, IAST: Sahasrāra), commonly translated as "thousand-petalled" and also known as the Crown Chakra, is considered the seventh primary chakra in the yogic and tantric traditions of Indian spirituality. The name derives from the Sanskrit word for "thousand," reflecting the symbolic depiction of the chakra as a many-petalled lotus.
Within these traditions, the system of chakras describes subtle energy centres situated along the human body, with Sahasrāra placed at the crown of the head as the highest of the principal chakras. It is generally regarded in textual and meditative traditions as the culminating centre of spiritual awareness, often associated with states of higher consciousness reached through practices such as meditation and yoga.
Sahasrāra is conventionally represented by the colour violet. Iconographic and devotional depictions vary across schools of yoga and tantra, but the thousand-petalled lotus remains its most recognisable symbol. The chakra carries a number of alternative names and spellings across regional languages and textual sources.
References
Adapted from the English Wikipedia article on Sahasrara.