對計算機的指令、數據或字以及數據傳輸所預先確定的且必須遵循的各種符號的次序、結構或位置。次序必須遵循，否則計算機不能理解和解釋信息。The predetermined mandatory order, organization or position of symbols in a computer instruction, data or word, data transmission message, etc. The order is mandatory so that the computer can understand and interpret the information.