A thumb signal, usually described as a thumbs-up or thumbs-down, is a common hand gesture achieved by a closed fist held with the thumb extended upward or downward, respectively. The thumbs-up gesture is associated with positivity, approval, achievement, satisfaction and solidarity, while the thumbs-down gesture is associated with concern, disapproval, dissatisfaction, rejection and failure.
While it is clear that the thumb was involved, the precise type of gesture described by the phrase pollice verso and its meaning are unclear in the historical and literary record. According to Anthony Corbeill, a classical studies professor who has extensively researched the practice, thumbs up signalled killing the gladiator while "a closed fist with a wraparound thumb" meant sparing him. Where Does the 'Thumbs-Up' Gesture Really Come From?, Time In modern popular culture it is wrongly presumed that "thumbs down" was the signal that a defeated gladiator should be condemned to death; "thumbs up", that he should be spared.
Desmond Morris in Gestures: Their Origins and Distribution traces the practice back to a medieval custom used to seal business transactions, suggesting that over time, the mere sight of an upraised thumb came to symbolize harmony and kind feelings. For example, see the seventeenth-century Diego Velázquez painting The Lunch.
Popularization in the United States is generally attributed to the practices of World War II Aviator, who used the thumbs up to communicate with ground crews before take-off. This custom may have originated with the China-based Flying Tigers, who were among the first American flyers involved in World War II. The appreciative Chinese would say ting hao de (挺好的) meaning "very good", and gesture with a thumbs up, which in Chinese means "you're number one". High officials in the Chinese government see it as a sign of respect.
During World War II, pilots on US adopted the thumbs-up gesture to alert the deck crew that they were ready to go and that the wheel chocks could be removed. On modern US carriers, specific deck crew hold a thumb up to signal to the pilot and control tower that their station is OK for take-off. American GIs are reputed to have picked up on the thumb gesture and spread it throughout Europe as they marched toward Berlin. According to Luís da Câmara Cascudo, Brazilians adopted the thumbs up from watching American pilots based in northern Brazil during World War II.
In 2023, a farmer in Canada was fined $82,000 Canadian dollar (around $64,500 in 2025 USD), having used a thumbs-up emoji in response to a text message contract, which was ruled as a binding agreement. The farmer failed to fulfill the contract by not delivering the expected amount of flax, leading to the penalty. The judge considered the emoji's meaning of assent or approval, concluding that it can serve as a digital signature. The ruling recognized the use of non-traditional methods, like emojis, in confirming contracts in today's technological landscape.
In Tibet, the thumbs-up gesture is a traditional way of begging for mercy. A dam ignited rare Tibetan protests. They ended in beatings and arrests, BBC finds, BBC News, 24 Dec 2024
In Iran, the sign has been said to have a pejorative meaning. In recent years however, the negative meaning of the gesture has generally disappeared. This is largely due to increased exposure to Western culture, especially the use of the thumbs-up symbol in social media.
In Germany, France, Hungary and Finland the gesture can simply indicate the number one, in the right context.
The thumbs-up gesture is used on the logo of Thums Up, a popular brand of cola from India. Starting in 2007, the thumbs-up also appeared on India's one-rupee coin.
On the Internet, and most particularly on the social media site Facebook, the thumbs-up gesture is shown as an icon and is associated with the term "like"—which within that context means to follow or subscribe to the page, posts, or profile of another individual or company; and on YouTube, individual videos may be voted on positively or negatively by clicking the thumbs-up or thumbs-down icons respectively (which in some previous versions of the site, used to be accompanied by "Like" and "Dislike" labels, and are still referred as such nowadays), and in the case of a thumbs-up, the video gets added to the user's "Liked videos" playlist. See like button.
In underwater diving signals, thumb up means "let's go up".
In baseball, umpires will sometimes jerk a thumbs-up over their shoulder as an "out" signal
Texas A&M University uses a thumbs-up as their Gig 'em hand signal, as it represents the action of gigging. The gesture and corresponding slogan "Gig 'em, Aggies!" were popularized in the early 20th century, becoming the first hand sign of the Southwest Conference.
Amusement park rides such as roller coasters are usually cleared for departure using a thumbs-up signal from the workers after inspection that all safety precautions have been taken.
21st century
International usage
Context-specific usage
Film reviews
Social media
Hitchhiking
Sports
Safety
Unicode
Other encodings
See also
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