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bucky bit
In computing, a bucky bit is a bit in a binary representation of a character that is set by pressing on a keyboard modifier key other than the shift key.
==Overview==
Setting a bucky bit changes the output character. A bucky bit allows the user to type a wider variety of characters and commands while maintaining a reasonable number of keys on a keyboard.
The keys corresponding to bucky bits on modern keyboards are the alt key, control key, meta key, command key ((unicode:⌘)), and option key.
In ASCII, the bucky bit is usually the 8th bit (also known as meta bit). However, in older character representations wider than 8 bits, more high bits could be used as bucky bits. In the modern X Window System, bucky bits are bits 18-23 of an event code.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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