Rudrani
Rudrani is the shakti and consort of Rudra (Shiva). She later came to be identified as a manifestation of Adi Parashakti. Rudrani is the divine will and power related to Lord Shiva (Rudra). She is also a Matrika known as Maheshwari.
In accordance with traditions, a Devi will gain an epithet from her consorts name. Saraswati, the consort of Brahma, has the epithets Brahmani/Brahmi. Lakshmi, the consort of Vishnu/Narayana, has the epithets Vaishnavi. Parvati is also called Narayani because she is the sister of Narayana.
Similarly, Parvati, the consort of Rudra/Shiva, has the epithets Rudrani/Shivani/Maheshwari/Mahadevi.
Although all the female versions of all male deity's names are epithets for Devi, these specific epithets such as Brahmani, Vaishnavi, Rudrani, etc. are included in another separate group of Devis, the Matrikas. They also possess the traditional symbols associated with their consorts. Rudrani possesses a trident, damru, crescent moon, snake etc. which are usually attributed to Shiva.
Parvati is a mild manifestation of Devi, and the name Rudrani (from its root Rudra, roughly meaning ferocious/angry) denotes a more ferocious disposition.