What is ↑  Shift + ⌥ Opt + Tab keyboard shortcut for?

Popular programs using this shortcut

What this shortcut does in different programs?

1. Final Cut Pro X - Navigate to the previous text item  
2. Luna (DAW) - Extends the selection to the previous transient in the selected tracks.  
3. AWS Cloud9 IDE (Mac) - Previous Tab  
4. Twitterrific 6 - Switch to previous account  

All programs

All programs using this shortcut, by category.

Note: This page includes variations for Shift + Option + Tab
Shift + Tab + Option
Option + Shift + Tab
Option + Tab + Shift
Tab + Option + Shift
Tab + Shift + Option
Shift + Option + Tab. Restrict to only Shift + Option + Tab.