Varahi, Avatar of Vishnu depicted as Female Version of Varaha, the Boar

One of the Sapta Matrikas (Seven Mothers), Varahi is depicted with the head of a sow, She is the shakti (feminine energy, or sometimes, consort), or female version, of Varaha, the boar Avatar of Vishnu. She is usually worshipped at night, and according to secretive Vamamarga Tantric practices. (From the Devi Mahatmya of the Markandeya Purana.)

Image of Satguru Sivaya Subramuniyaswami
The teachings of yoga are so basically simple and so basically concrete. And the most beautiful thing in the world, on contemplation, is the simplest thing in the world. The most beautiful design is the simplest design.
—Gurudeva