An A-ok /ˌeɪ.oʊˈkeɪ/ is both a saying, derived from okay, and a hand-gesture done by connecting the thumb and forefinger in to a circle (the O), and holding the other fingers straight or relaxed in the air.

Unicode symbol U+1F44C (👌) represents this gesture.

US Air Force Lt. Col. John "Shorty" Powers popularized the expression "A-ok" while NASA's public affairs officer for Project Mercury, attributing it to astronaut Alan Shepard during his Freedom 7 flight. In his book The Right Stuff, however, author Tom Wolfe wrote that Powers had borrowed it from NASA engineers who used it during radio transmission tests because the sharper sound of A cut through the static better than O. Apparently, the first documented use "A-ok" is contained within a memo from Tecwyn Roberts, Flight Dynamics Officer, to Flight Director (entitled "Report on Test 3805", dated Feb 2, 1961) in penciled notes on the countdown of MR-2, dated Jan 31, 1961.

While the gesture is positive in some countries, in certain parts of middle and southern Europe (although not in Spain or Portugal) the gesture is considered offensive, as in you are a zero or you are nothing. In some Mediterranean countries, as well as in Brazil, it represents vulgar expressions: either an insult (you are an asshole), or the slang for anus itself. In Brazil it can either mean okay or up yours! if the palm of the hand is faced to the performer, especially the performer's torso. By the same symbolism, it stands for marica (faggot) in several South American countries.

The Lao Song (Thai: ลาวโซ่ง [laːsoːŋ]^{[missing tone]}) are an ethnic group of Thailand. The Lao Song are also known as the Tai Song (ไทโซ่ง), Lao Song Dam (ลาวโซ่งดำ) or simply as the Song or Song Dam.

The Lao Song are descendants of Lao peoples from the areas of Tonkin and areas east of Luang Prabang when they were forcibly removed to the areas of Central Thailand today as slaves and corvée labourers during Siamese annexation during the 18th and 19th centuries. Most were members of the Tai Dam ethnic group (counted by the Chinese government as members of the Dai ethnic group) and the traditional dress, language, and culture is remarkable as a preservation of Tai Dam culture in the heart of Central Thailand and Thaification policies. The Lao Song were used as guards for the royal courts and to help control the powerful Chinese minority, which explains their widespread distribution.

There are approximately 34,000 Lao Song spread out over Central Thailand, including Phetchabun, Phitsanulok, Nakhon Sawan, Ratchaburi, Suphan Buri, Kanchanaburi, Chumphon and Nakhon Pathom Provinces.