The Shift key ⇧ Shift 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. The Shift key's name originated from the typewriter, where one had to press and hold the button to shift up the case stamp to change to capital letters; the shift key was first used in the Remington No. 2 Type-Writer of 1878; the No. 1 model was capital-only.  On the US layout and similar keyboard layouts, characters that typically require the use of the shift key include the parentheses, the question mark, the exclamation point, and the colon.
When the caps lock key is engaged, the shift key may be used to type lowercase letters on many operating systems, though not on macOS.
The keyboard symbol for the Shift key (which is called Level 2 Select key in the international standard series ISO/IEC 9995) is given in ISO/IEC 9995-7 as symbol 1, and in ISO 7000 “Graphical symbols for use on equipment” as a directional variant of the symbol ISO-7000-251. In Unicode 6.1, the character approximating this symbol best is U+21E7 upwards white arrow (⇧). This symbol is commonly used to denote the Shift key on modern keyboards (especially on non-US layouts and on the Apple Keyboard), sometimes in combination with the word “shift” or its translation in the local language. This symbol also is used in texts to denote the shift key.
On computer keyboards, as opposed to typewriter keyboards, the shift key can have many more uses:
On some keyboards, if both shift keys are held down simultaneously only some letters can be typed. For example, on the Dell keyboard Model RT7D20 only 16 letters can be typed. This phenomenon is known as "masking" and is a fundamental limitation of the way the keyboard electronics are designed.
The following is a list of actions involving the shift key for the Microsoft Windows operating system.
|Press Ctrl+⇧ Shift+Esc||Opens the Windows Task Manager.||3.1+|
|Hold ⇧ Shift + click Restart||Reboots Windows only and not the entire system.||95, 98, ME|
|Hold ⇧ Shift + insert CD||Holding shift while inserting a compact disc in a Microsoft Windows computer will bypass the autorun feature. This ability has been used to circumvent the MediaMax CD-3 CD copy protection system.||95+|
|Hold ⇧ Shift + click close button||In Windows Explorer, closes the current folder and all parent folders.||95+|
|Press ⇧ Shift+Delete||In Windows Explorer, if pressed with objects selected, such as files and folders, this will bypass the recycle bin and delete the selected objects permanently. Alternatively, holding shift and selecting the delete option in the context menu of the selected objects will achieve this. Retrieving deleted objects after this is only possible using recovery software.||95+|
|Press ⇧ Shift+Tab ↹||Focuses on the previous object in the objects that are focusable in many Windows applications, such as the previous form control on a form in Internet Explorer.||3.1+|
|Press ⇧ Shift 5 times||Toggles activation of StickyKeys on and off.||95+|
|Hold the right⇧ Shift for 8 seconds||Toggles activation of FilterKeys on and off.||95+|
|Press both ⇧ Shift keys||Inactivates StickyKeys if it is activated.||95+|
|Press left Alt + left ⇧ Shift + Num Lock||Toggles activation of MouseKeys on and off.||95+|
|Press left Alt + left ⇧ Shift + Print Screen||Toggles activation of High Contrast on and off.||95+|
|Press ⊞ Win+⇧ Shift+Tab ↹||Highlights the last task in the task bar. Continue to cycle through the task bar with the arrow keys, ⊞ Win+Tab ↹ (forward), ⊞ Win+⇧ Shift+Tab ↹ (backwards), or alphanumeric keys (highlights the task that begins with the alphanumeric character that is pressed). Press Space Bar or ↵ Enter to open the task.||95+|
|Press Alt+⇧ Shift+Tab ↹||Displays a list of the tasks in the task bar for as long as the Alt is held down. Selects the last task in the list. Continue to cycle through the list by pressing ⇧ Shift+Tab ↹. Release Alt to open the selected task.||3.1+|
|Press Ctrl+⇧ Shift+Tab ↹||Selects the previous tabbed window in any Windows applications is that use the tabbed window control.||3.1+|
|Press ⊞ Win+⇧ Shift+S||Opens Snip & Sketch||10|
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