The style of architecture used in the Deogarh temple in Uttar Pradesh is known as Panchayatana.

Panchayatana Architecture:
Panchayatana is a temple architectural style that originated in ancient India. It refers to a layout where multiple shrines or sanctuaries are arranged around a central shrine within a common enclosure. The term "Panchayatana" comes from the Sanskrit words Pancha, meaning "five," and Ayatana, meaning "sanctuary" or "shrine."

Features of Panchayatana Architecture:
The Panchayatana architectural style typically includes the following features:

1. Central Shrine:
The central shrine, also known as the main sanctum or garbhagriha, houses the main deity of worship. It is the most important and prominent structure within the temple complex. In the Deogarh temple, the central shrine would have housed the main deity.

2. Auxiliary Shrines:
Surrounding the central shrine, there are usually four smaller shrines or sanctuaries known as the auxiliary shrines. These shrines are dedicated to subsidiary deities or manifestations of the main deity. In the case of the Deogarh temple, there would have been four auxiliary shrines surrounding the central shrine.

3. Common Enclosure:
All the shrines, including the central and auxiliary shrines, are enclosed within a common wall or enclosure. This enclosure serves to demarcate the sacred space of the temple complex.

4. Symmetrical Layout:
The Panchayatana style follows a symmetrical layout, where the central shrine is placed in the center and the auxiliary shrines are arranged around it. This symmetrical arrangement creates a balanced and harmonious composition.

Significance of Panchayatana Architecture:
Panchayatana architecture represents a holistic approach to temple design, where the central deity is worshipped along with its associated deities. It symbolizes the unity and interconnectedness of different deities within the Hindu pantheon.

In conclusion, the Deogarh temple in Uttar Pradesh follows the Panchayatana architectural style, characterized by a central shrine surrounded by four auxiliary shrines within a common enclosure. This style highlights the harmonious coexistence of various deities and signifies the holistic worship of multiple divine entities.