What is "tridevi"

The Tridevi (; Sanskrit: त्रिदेवी ) is a concept in Hinduism joining a triad of eminent goddesses either as a feminine version of the Trimurti or as consorts of a masculine Trimurti, depending on denomination. This triad is typically personified by the Hindu goddesses Saraswati, Lakshmi, and Parvati ( kali). In Shaktism, these triune goddesses are the manifestations of Mahashakti, the supreme divinity.

In the Navratri ("nine nights") festival, "the Goddess is worshiped in three forms. During the first three nights, Durga or Parvati is revered, then Lakshmi on the fourth, fifth and sixth nights, and finally Saraswati until the ninth night."