A prang (Khmer: ?; Thai: , pronounced [pr?:?]) is a tall tower-like spire, usually richly carved. They were a common shrine element of Hindu and Buddhist architecture in the Khmer Empire. They were later adapted by Buddhist builders in Thailand, especially during the Ayutthaya Kingdom (1350-1767) and Rattanakosin Kingdom (1782-1932). In Thailand it appears only with the most important Buddhist temples.
Prang tower took form of a multi-tiered structure with receding size as it ascends. The receding size of almost identical roof structures of the stepped pyramidal tower, creates a perspective illusion as if the tower is taller than it actually is. The form of the tower is a reminiscent of Indic shikhara of Hindu temple, although slightly different in design. On each cardinal points, a prang usually has richly adorned tympanum and lintel above doorways or blind doors. The prang took plan of multi corners rectangular, which on top of each roof steps are adorned with antefixes, which mostly took theme of multi-headed N?gas, Garuda or deities.
The cella was entered via a small porch, usually aligned to the east, which was called the Mandapa. Over the cubic cella rose the central tower, the bud-shaped prang, modeled after the cosmic mountain Meru, crowned by a top stone in form of a lotus bud.
The Khmer prangs resembled north Indian temples' shikhara and rekha (temple towers) elements. The early 10th century and the late 12th century prangs in Thailand were influenced by the Khmer architects of the great temple complexes of Angkor Wat and Angkor Thom.
After the Khmer Empire collapsed, the Thai building masters of the Sukhothai Kingdom adapted the Prang form. They extended and developed it. The building material was no more separate small sandstone blocks, instead the Thais built the Prang in brick or laterite covered with stucco. And the cella could be reached only by stairs. An example for this is the Prang of the Wat Mahathat in Phitsanulok. Later developments of the Prang suggested the cella only. The entrance door became a niche, in which was placed the Buddharupa (Buddha statue), which had originally taken the central position inside. For reasons of symmetry the niche was repeated on all four sides. On its pinnacle was a Trishul, the "weapon of Indra".
A "more modern" Prang is a slim construction, like an ear of corn, which lets its Khmer origin be only suspected. The best example is Wat Arun, the landmark of Bangkok. Also Wat Phra Kaeo has six thin Prangs arranged in a row. Another example is the four Prangs arranged in all four directions around Wat Pho in Bangkok, and the five Prangs in Wat Pichayart in Thonburi.