Guhyasamaja is a tantric deity in Tibetan Buddhism. The name Guhyasamaja means "Assembly of Secrets" and it is considered one of the most important tantras of the Anuttarayoga class. The deity represents the ultimate reality of the universe and the nature of mind. The Guhyasamaja deity is typically depicted as a blue-skinned man with two faces and four arms. He sits in a relaxed posture on a throne or lotus seat. The right face represents the peaceful aspect of the deity, while the left face represents the wrathful aspect. The right-hand holds a vajra, a ritual object symbolizing indestructibility, and the left-hand holds a bell. The upper right-hand holds a sword, which symbolizes the cutting of ignorance, and the upper left-hand holds a gemstone, which symbolizes the attainment of wisdom. Guhyasamaja is considered a powerful and fierce deity, associated with the attainment of the highest tantra, the Anuttarayoga tantra. His practice is said to be highly secret and only initiated into those deemed ready by their teachers. The Guhyasamaja practice is said to be a powerful way to achieve spiritual advancement and attain enlightenment, and attain the ultimate level of awareness. The Guhyasamaja tantra is also considered key teaching in Tibetan Buddhism, and it is believed to reveal the secrets of the universe and the ultimate nature of reality. The Guhyasamaja practice is said to be highly effective in removing obstacles, pacifying conflicts, and destroying negative influences. His mantra, "Om Guhyasamaja Hum," is also a popular one to recite for protection and to invoke the power of the Buddha.