• 문자,character
       [[control_code]] { Srch:control_code https://foldoc.org/control+code }
• 부호,code
       [[control_code]] =,control_code . control_code
       WtEn:control_code
• 제어문자,control_character
       [[control_code]] Srch:control_code
       https://en.wikipedia.org/wiki/C0_and_C1_control_codes
• 프로토콜,protocol
        byte인 [[control_code]] ? [[control_charcter]]? 를 쓰는 ?

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