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A-ok
An A-ok is both a saying, derived from okay, and a hand-gesture done by connecting the thumb and index finger into a circle (the ''O''), and holding the other fingers straight or relaxed in the air, forming a disassembled ''K''.
Unicode symbol U+1F44C (👌) represents this gesture.
==Etymology==
US Air Force Lt. Col. John "Shorty" Powers popularized the expression "" while NASA's public affairs officer for Project Mercury, and was reported as attributing it to astronaut Alan Shepard during his ''Freedom 7'' flight.〔 However, the NASA publication ''This New Ocean: A History of Project Mercury'' says in a footnote: "A replay of the flight voice communications tape disclosed that Shepard himself did not use the term." and that "Tecwyn Roberts of STG and Capt. Henry E. Clements of the Air Force had used 'A.OK' frequently in reports written more than four months before the Shepard flight."〔 Apparently, the first documented use of "" is contained within a memo from that Tecwyn Roberts, a Flight Dynamics Officer, to Flight Director (entitled "Report on Test 3805", dated Feb 2, 1961) in penciled notes on the countdown of MR-2 (Mercury-Redstone 2), dated Jan() 31, 1961.〔("Tecwyn Roberts: A-OK." ) ''llanddaniel.co.uk.'' Retrieved: May 5, 2011. 〕 In his book ''The Right Stuff'' 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''".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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