What is Control + ⌥ Opt + ⌘ Cmd + Power keyboard shortcut for?

Popular programs using this shortcut

What this shortcut does in different programs?

1. Apple macOS - Quit all apps, then shut down your Mac. If any open documents have unsaved changes, you'll be asked whether you want to save them  

All programs

All programs using this shortcut, by category.

Note: This page includes variations for Control + Option + Command + Power
Control + Command + Option + Power
Option + Control + Command + Power
Option + Command + Control + Power
Command + Option + Control + Power
Command + Control + Option + Power
Control + Option + Command + Power. Restrict to only Control + Option + Command + Power.