Each niche on both sides of Shanmen Hall enshrines a statue of a heavenly deity with a Vajra in his hand, namely Nio, Buddha's warrior attendant, also known as "Yakasha Deity" (夜叉神) or "Zhijingang" (執金剛).
Vajra originally refers to the short metal weapon of king of all heavenly deities Indra in Indian mythology and symbolizes solidness and sharpness in Buddhism.
Nio is a Dharmapala who protects Buddhism with his Vajra in his hand.

Originally, there is only one Nio.
However, in order to meet Chinese custom of being in pairs, Chinese people cast two Nio to safeguard the mount gate after the introduction of Buddhism from India to China in the Eastern Han Dynasty (25-220).
The Nio are wearing crowns, ethereal clothes with their upper bodies exposed, with well-developed muscles and short skirts.
The Nio have widely open eyes and protruding noses, holding weapons in their hands, and glaring the ground awesomely and angrily.
The Nio, the right one, has its mouth open to pronounce the sound "a", while the other has it closed to utter the sound "hong".
The symbolism is the same already seen.
The generic name for statues with an open mouth is General Ha (哈將軍; Japanese: 阿吽), that for those with a closed mouth General Heng (哼將軍; Japanese: 阿形). "
A" and "Hong", are the start and end sounds in Sanskrit, symbolizing the basis of sounds and bearing the profound theory of Dharma.
Each niche on both sides of Shanmen Hall enshrines a statue of a heavenly deity with a Vajra in his hand, namely Nio, Buddha's warrior attendant, also known as "Yakasha Deity" (夜叉神) or "Zhijingang" (執金剛). Vajra originally refers to the short metal weapon of king of all heavenly deities Indra in Indian mythology and symbolizes solidness and sharpness in Buddhism. Nio is a Dharmapala who protects Buddhism with his Vajra in his hand.
Originally, there is only one Nio. However, in order to meet Chinese custom of being in pairs, Chinese people cast two Nio to safeguard the mount gate after the introduction of Buddhism from India to China in the Eastern Han Dynasty (25-220). The Nio are wearing crowns, ethereal clothes with their upper bodies exposed, with well-developed muscles and short skirts. The Nio have widely open eyes and protruding noses, holding weapons in their hands, and glaring the ground awesomely and angrily. The Nio, the right one, has its mouth open to pronounce the sound "a", while the other has it closed to utter the sound "hong". The symbolism is the same already seen. The generic name for statues with an open mouth is General Ha (哈將軍; Japanese: 阿吽), that for those with a closed mouth General Heng (哼將軍; Japanese: 阿形). "A" and "Hong", are the start and end sounds in Sanskrit, symbolizing the basis of sounds and bearing the profound theory of Dharma.
Hall of Shanmen