One of the mysteries of the English language finally explained.
A mark of ‘OK’, or other sign indicating that something is satisfactory; specifically a gesture made by forming the thumb and index finger into a circle with the remaining fingers raised and spread, signifying understanding, agreement, approval, etc., or that the signaller is all right.
1920s; earliest use found in Hart Crane (1899–1932), poet. From OK [interjection¹, noun², adverb] + sign.
OK sign/(ˌ)əʊˈkeɪ ˌsʌɪn/
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