What is Ctrl Alt Z?

What is Ctrl Alt Z?
General shortcuts

Action
Windows
Chrome OS

View menu
Alt + V

Undo the last operation
Ctrl + Z , or Alt + Backspace
Ctrl + Z

Redo the last operation
Ctrl + Y , or Alt + Shift + Backspace
Ctrl + ⇧ Shift + Z

Cut the selection and store it in the clipboard
Ctrl + X , or ⇧ Shift + Del
Ctrl + X

General shortcuts
Action Windows Chrome OS
View menu Alt + V
Undo the last operation Ctrl + Z , or Alt + Backspace Ctrl + Z
Redo the last operation Ctrl + Y , or Alt + Shift + Backspace Ctrl + ⇧ Shift + Z
Cut the selection and store it in the clipboard Ctrl + X , or ⇧ Shift + Del Ctrl + X