ヘッディング開かい始しMeanings1nounstart of heading; SOHcomputingComputing term for the ASCII control character (0x01) that marks the beginning of a message header.通つう信しんプロトコルでは、ヘッディング開かい始しを示しめす制せい御ぎょ文も字じが使つかわれる。In communication protocols, a control character indicating the start of heading is used.