The shortcut key for redo varies depending on the program and operating system being used. Here are some common shortcut keys for redo:

• Windows: Press Ctrl+Y or Ctrl+Shift+Z to redo an action that has been undone.
• Mac: Press Command+Y or Command+Shift+Z to redo an action that has been undone.

Its important to note that not all programs support the redo function, and some programs may have different shortcut keys for redo.