What is Control + ⌥ Opt + ↑  Shift + ← keyboard shortcut for?

Popular programs using this shortcut

What this shortcut does in different programs?

1. AWS Cloud9 IDE (Mac) - Select Next Before  
2. Ace Editor (Mac) - Remove current occurrence from multi-selection and move to previous  
3. SizeUp (macOS) - Upper left  
4. Ace Editor 1.35.2 (macOS) - Remove current occurrence from multi-selection and move to previous  

All programs

All programs using this shortcut, by category.

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