Shift key

Keyboard-left keys

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ISOIEC-9995-7-001--ISO-7000-0251--Symbol-for-Level-2-Select

Shift key is a modifier key on a keyboard, used to type capital letters and other alternate "upper" characters. There are typically two shift keys, on the left and right sides of the row below the home row. It is labeled as "Shift" on most keyboards.

Function

The primary function of the shift key is to capitalize letters when typing. When the shift key is held down and a letter key is pressed, the capital version of the letter is produced. In addition to letters, the shift key changes the output of some numbers and punctuation marks to symbols. For example, pressing shift in combination with the '2' key typically produces the "@" symbol on a US keyboard layout.

The shift key can also be used in combination with other keys to perform keyboard shortcuts. These shortcuts can vary depending on the operating system and the software application being used. Common functions include highlighting text, opening context menus, and activating specific features within software applications.

History

The shift key's origins can be traced back to typewriters. Early typewriters had a physical mechanism that shifted the position of the typebars, allowing different characters to be typed using the same keys. This mechanism was carried over to computer keyboards, where it became a virtual modifier key rather than a physical shift of the mechanism.

Usage in Software

In software applications, the shift key is used not only for typing but also for executing specific commands. For example, in word processors, holding the shift key while pressing the arrow keys will select text. In graphic design software, holding the shift key can constrain the movement of elements to straight lines or specific angles.

Accessibility

The shift key plays a significant role in accessibility features for users with physical disabilities. Sticky keys is an accessibility feature that allows the shift key (and other modifier keys) to remain active without being held down, enabling users with limited dexterity to perform keyboard shortcuts and other key combinations more easily.

See Also

• Caps Lock
• Control key
• Alt key
• Modifier key
• Keyboard layout