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Caps Lock ⇪ Caps Lock is a button on a computer keyboard that causes all letters of bicameral scripts to be generated in capital letters. It is a toggle key: each press reverses the previous action. Some keyboards also implement a light, to give visual feedback about whether it is on or off. Exactly what Caps Lock does depends on the keyboard hardware, the operating system, the device driver, and the keyboard layout. Usually, the effect is limited to letter keys. Letters of non-bicameral scripts (e.g. Arabic, Hebrew, Hindi) and non-letter characters are generated normally. Whenever the key gets engaged with the shift keys, they may be used to type both lowercase letters and other alternate "upper" characters on many operating systems, but not lowercase letters on macOS.

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