Upanishads are prime portions of the Vedas, They are the foundational theological discourses of Hindu traditions called Vedanta or the conclusion of the Vedas.
Upanishad 12 in English rhyme comprises of the Mantrika Upanishad, Varaha Upanishad, Yajnavalkya Upanishad, Yoga Kundalini Upanishad, Yoga Sikha Upanishad, Yoga Tattva Upanishad and the Tripura Tapini Upanishad written in English rhyme with the original Sanskrit text.