"Jagannath" is a compound word, consisting of "Jagat" and "Nath". The word nath means "Master, Lord" (n?tha) while jagan or jagat means the "universe". Thus, Jagannath means "lord of the universe".

In the Odia language, "Jagannath" is linked to other names, such as "Jag?" (???) or "Jagabandhu" (???????) ("Friend of the Universe"). Both names derive from "Jagannath". Further, on the basis of the physical appearance of the deity, names like "K?lya" (?????) ("The Black-coloured Lord", but which can also mean "the Timely One"), "Darubrahman" (??????????) ("The Sacred Wood-Riddle"), "D?ru?debat?" (???? ????? "The wooden god"), Chak??khi (??? ???) or "Chak?nayan" (??? ??? "With round eyes"), "Cak?????" (??? ???? "with round pupils") are also in vogue.

According to Dina Krishna Joshi, the word may have origins in the tribal word Kittung of the Sora people (Savaras). This hypothesis states that the Vedic people as they settled into tribal regions adopted the tribal words and called the deity Jagannath. According to O.M. Starza, this is unlikely because Kittung is phonetically unrelated, and the Kittung tribal deity is produced from burnt wood and looks very different from Jagannath.

The icon of Jagannath in his temples is a brightly painted, rough-hewn log of neem wood. The image consists of a square flat head, a pillar that represents his face merging with the chest. The icon lacks a neck, ears, and limbs, is identified by a large circular face symbolizing someone who is anadi (without beginning) and ananta (without end). Within this face are two big symmetric circular eyes with no eyelids, one eye symbolizing the sun and the other the moon, features traceable in 17th-century paintings. He is shown with an Urdhva Pundra, the Vaishnava U-shaped mark on his forehead. His dark color and other facial features are an abstraction of the cosmic form of the Hindu god Krishna, states Starza. In some contemporary Jagannath temples, two stumps pointing forward in hug-giving position represent his hands. In some exceptional medieval and modern era paintings in museums outside India, such as in Berlin states Starza, Jagannath is shown "fully anthropomorphised" but with the traditional abstract mask face.

The typical icon of Jagannath is unlike other deities found in Hinduism who are predominantly anthropomorphic. However, aniconic forms of Hindu deities are not uncommon. For example, Shiva is often represented in the form of a Shiva linga. In most Jagannath temples in the eastern states of India, and all his major temples such as the Puri, Odisha, Jagannath is included with his brother Balabhadra and sister Subhadra. Apart from the principal companion deities, Jagannath icon shows a Sudarshana Chakra and sometimes under the umbrella cover of multiheaded Sesha Naga, both linking him to Vishnu. He was one of the introduction to Hinduism to early European explorers and merchants who sailed into Calcutta and ports of the Bay of Bengal. The Italian Odoric of Pordenone who was a Franciscan friar, visited his temple and procession in 1321 CE, and described him in the language of the Church. William Burton, visited his temple at Puri in 1633, spelled him as Jagarnat and described him to be "in a shape like a serpent, with seven hoods".

When shown with Balabhadra and Subhadra, he is identifiable from his circular eyes compared to the oval or almond shape of the other two abstract icons. Further, his icon is dark, while Balabhadra's face is white, and Subhadra's icon is yellow. The third difference is the flat head of Jagannath icon, compared to semi-circular carved heads of the other two. They are accompanied by the Sudarshana Chakra, the iconic weapon of Vishnu. It is approximately the same height as Balabhadra, is red in colour, carved from a wooden pillar and clothed, unlike its traditional representation as a chakra in other Vishnu temples. Jagannath iconography, when he is depicted without companions, shows only his face, neither arms nor torso. This form is sometimes called Patita Pavana, or Dadhi Vaman.

The murtis of Jagannath, Balabhadra, Subhadra and Sudarshana Chakra are made of neem wood. Neem wood is chosen because the Bhavishya Purana declares it to be the most auspicious wood from which to make Vishnu murtis. The wood icon is re-painted every year before the Ratha-Yatra. It is replaced with a newly carved image every 12 or 19 years approximately, or more precisely according to the luni-solar Hindu calendar when its month of Asadha occurs twice in the same year.

Attributes

Jagannath is considered an avatar (incarnation) of Vishnu. Others consider him equivalent to the Hindu metaphysical concept of Brahman, wherein he then is the Avatar?, i.e., the cause and equivalence of all avatars and the infinite existence in space and time. According to author Dipti Ray in Prataparudra Deva, the Suryavamsi King of Odisha:

In Prataparudradeva's time Odia poets accepted Sarala Dasa's idea and expressed in their literary works as all the Avataras of Vishnu (Jagannath) manifest from him and after their cosmic play dissolute (bilaya) in him (Jagannath). According to them Jagannath is Sunnya Purusa, Nirakar and Niranjan who is ever present in Nilachala to do cosmic play ... The five Vaishnavite Sakhas of Orissa during Prataparudradeva's time expounded in their works the idea that Jagannath (Purushottama) is Purna Brahman from whom other Avataras like Rama, Krishna, etc., took their birth for lilas in this universe and at the end would merge in the self of Purna Brahman.

—?Dipti Ray

In the Jagannath tradition, he has the attributes of all the avatars of Vishnu. This belief is celebrated by dressing him and worshipping him as different avatars on special occasions. However he is most frequently identified with Krishna, the eighth avatar of Vishnu. The Puranas relate that the Narasimha Avatar of Vishnu appeared from a wooden pillar. It is therefore believed that Jagannath is worshipped as a wooden murti or Daru Brahma with the Sri Narasimha hymn dedicated to the Narasimha Avatar. Every year in the month of Bhadra, Jagannath is dressed and decorated in the form of the Vamana avatar of Vishnu. Jagannath appeared in the form of Rama, another avatar of Vishnu, to Tulsidas, who worshipped him as Rama and called him Raghunath during his visit to Puri in the 16th century.

Tantric deity

Outside of Vaishnava tradition, Jagannath is considered the epitome of Tantric worship. The symmetry in iconography, the use of mandalas and geometric patterns in its rites support the tantric connection proposal. Jagannath is venerated as Bhairava or Lord Shiva