What is "siddhidatri"

Siddhidatri is the ninth form of the Goddess Durga, the meaning of her name is as follows: Siddhi means supernatural power or meditative ability, and Dhatri means giver or awarder. She is worshipped on the ninth day of Navaratri (nine nights of Navadurga), she fulfills all the divine aspirations and completes the mundane.

In this form Durga is seated on a lotus and is four-armed. She holds a lotus, mace, discus and conch shell. In this form Durga removes ignorance and she provides the knowledge to realize That or Brahman. She is surrounded by Siddhas, Gandharvas, Yakshas, Asura (Demons) and Devata (Gods) who are worshipping her. The Siddhi that she provides is the realization that only she exists. She is the mistress of all achievements and perfections.