Ungyō Naraen Kongō (那羅延金剛), also called Ungyō (吽形) in Japanese, is depicted either bare-handed or wielding a sword. He symbolizes latent strength,his mouth is rendered to form the sound "hūṃ", leading to his alternate name "Ungyō".
According to a Japanese story, there once was a king who had two wives. His first wife bore a thousand children who all decided to become monks and follow the Buddha's law. His second wife had only two sons. The youngest was named Non-o and helped his monk brothers with their worship. The eldest, Kongō Rikishi 金剛力士, however, had a much more aggressive personality. He vowed to protect the Buddha and his worshipers by fighting against evil
"In Japan, Martial Artists often use the sound "Osu" to express their attitude toward training. This sound is heard during the exchange of greeting between seniors and juniors, when entering the training hall, before performing Kata for review, and after receiving a pointer from the Sensei..."
As i have everything to learn from an artist like you, I greet you this way