Kneeling
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Kneeling is a basic human position where one or both knees touch the ground. Kneeling is defined as “to position the body so that one or both knees rest on the floor,” according to Merriam-Webster. Kneeling when only composed of one knee, and not both, is called genuflection.
A boy in the courtyard of the Great Umayyed Mosque in Syria
Worshippers kneeling (sujud-style) to pray
Kneeling in prayer is traditional in Christianity
Before the funeral, several portable, individual kneelers, called prie-dieus, were placed for use around this casket.
Kowtow
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A kowtow is the act of deep respect shown by prostration, that is, kneeling and bowing so low as to have one's head touching the ground. In Sinospheric culture, the kowtow is the highest sign of reverence. It was widely used to show reverence for one's elders, superiors, and especially the Emperor of China, as well as for religious and cultural objects of worship. In modern times, usage of the kowtow has been reduced.
Kowtowing in Chinese funeral rituals
A kowtowing official, Song dynasty
Vietnamese graduates pay gratitude by performing a Kowtow for their teachers during the Confucian court examination in 1897.