Undo, usually.
Control Z is a keyboard function on a Windows computer that will undo the last function. On a Mac keyboard, the same function is performed as Command Z. To perform the function, first press control (or command) and then press the Z key.
The shortcut key for 'undo' is Control Z. Control C is copy, Control V is paste and Control X is cut.
Ctrl Z on a keyboard undoes what you typed before.
At a usual keyboard there are 2 control keys.
nothing really, but on the keyboard z comes after x! cool right!
That is what the Z-Board is intended to do, replace the keyboard.
If the 'z' key on your keyboard is broken, you can try using the on-screen keyboard feature available in most operating systems. Alternatively, you can copy the letter 'z' from another source and paste it wherever you need it. Another option is to remap another key to function as 'z' using keyboard remapping software. Lastly, consider using a different keyboard if the issue persists.
The ones that have the alphabet from A to Z on them. eg QWERTY....
Ctrl + Z
HTC Desire Z
.
It means control!