<P> Amusement park rides such as roller coasters are usually cleared for departure using a thumbs - up signal from the crew after inspection that all safety precautions have been taken . </P> <P> The Indian cola brand Thums Up, now owned by The Coca - Cola Company is named after this symbol, and uses it as its logo . </P> <P> Unicode reserves 👍 or U + 1F44D symbol and 👎 or U + 1F44E symbol for the thumbs up and thumbs down gestures, respectively . A reversed (left - facing) thumbs up gesture is encoded at U + 1F592 . </P> <P> Other symbols are - b (right hand) and d - (left hand). Various instant messaging services use (y) and (n) as a shortcut for thumbs up and thumbs down emoji . </P>

What is the origin of the thumbs up