British explorer-author Sir John Barrow noted in his book Travels in China (1804) the Chinese custom of touching the ground with the forehead in the act of prostrating oneself, as an expression of deep respect, submission or worship, describing this as “koo-too, or ceremony of genuflexion and prostration”. Also found as ko-tou or ko-tow in other travellers’ writings, this has been standardised as kowtow or kow-tow, from the Chinese 叩頭 (Cantonese kautàu, Putonghua kòutóu), meaning “knock head”.

The practice dates back much further than the 19th century and is known to have been a custom by the time of the Qin dynasty (221-206BC), performed before the emperor in imperial protocol. The most solemn ceremonies would require subjects to undertake the grand kowtow – kneeling from a standing position three times, each time kowtowing thrice.

From kowtow comes finger kowtow (or tea tapping). This is the light tapping of one’s bent index and middle (and some­times ring) fingers on the table thrice after one’s cup is filled, in thanks to the tea server. The custom purportedly originated in the Qing dynasty, when the emperor, travelling incognito throughout his empire, might fill his servant’s teacup; the servant, so as not to reveal the emperor’s identity, would perform a finger kowtow in lieu of prostration.

Akowtowing emoticon has been in use in East Asia since the early 2000s: “orz” (right) shows someone on their hands and knees, with their head on the floor, “o” representing the head, “r” the arms and “z” the legs. The word came to mean, in Japanese internet slang, “hopelessness”, “despair” and “frustration”, and, in Korean usage, “respect”, often with the variant “llorz”, with “ll” representing the legs of the person you are kneeling in front of.