键盘扫描码（英语：scancode或scan code）是绝大多数计算机键盘向计算机发送的一项数据，用以报告哪些键被按下。它使用一个数字或数字序列来表示分配到键盘上的每个按键。
在内部，各种XIM 的共同机理是把调用XKB 通过上面叙述的过程把键盘扫描码转换成击键代码和键盘符号。
Internally, a common process of every XIM is to translate keyboard scan code into keycode and then to keysym, by calling XKB, whose process detail has been described in previous sections.
中文翻译：键盘上的键都分配有一个独一无二的扫描码，即和设备相关的标识符。
Assigned to each key on a keyboard is a unique value called a scan code, a device-dependent identifier for the key on the keyboard.
PC用键盘则恰恰相反，不但价格便宜，稳定可靠，而且是编码键盘，可自动扫描键盘并通过键盘用标准5芯插口发送按键的扫描码。
By contrast, PC keyboards are not only cheap, stable and reliable but also a kind of coded keyboard which can be scanned and send the scan code via a standard 5 core socket automatically.
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