the "wheel of time." It is also the deity associated with the Kalachakra mandala

wheel of time] The term refers to a secret teaching given by the Buddha and recorded in the Kalachakra Tantra. the deity associated with the teaching the Indian system of astrology "The Kalachakra Sand Mandala is a visual representation of the entire Kalachakra Tantra. It is also a two-dimensional representation of the five-story palace of the Kalachakra deity... Those who participate in making the sand mandala place themselves within the realm of the deity." - from The Wheel of Time Sand Mandala

Tibetan tantra wheel of Time.

(Skt.) (also spelled as Kalacakra): Time-Wheel; name of a specific DEITY.

( Skt.): Literally, "the wheel of time." A complex cycle of tantric teachings uniting astrology, the subtle energy body and spiritual practice in one coherent system. Name of a tantra and of the twenty-four-armed deity and consort featured in it.

Kalachakra (Sanskrit: ; ) is a term used in Tantric Buddhism that means "time-wheel" or "time-cycles". It refers both to a Tantric deity (Tib. yidam) of Vajrayana Buddhism and to the philosophies and meditation practices contained within the Kalachakra Tantra and its many commentaries. The Kalachakra Tantra is more properly called the Kalachakra Laghutantra, and is said to be an abridged form of an original text, the Kalachakra Mulatantra which is no longer extant.