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

Apple macOS - Arrow Extend text selection to the beginning of the current word, then to the beginning of the following word if pressed again  

Apple iBooks - Arrow Extend the selection to the beginning of the current word  

Ace Editor (Mac) - Select word left  

Google Docs (macOS) - Rotate counterclockwise by 1°  

Xcode - Extend selection to the beginning of the current word, then to the beginning of the previous word  

DaVinci Resolve 15 (Mac) - Multicam  > Previous page  

Adobe Premiere Pro (Mac) - Trim Backward Many  

Adobe Premiere Pro (Mac) - Decrease Kerning by Five Units  

Adobe Premiere Pro (Mac) - Trim Backward by Large Trim Offset  

Final Cut Pro X - Switch to the previous audio angle in the multicam clip  

Reserved Mac - Extend selection to the beginning of the current word, then to the beginning of the previous word.  

Mode SQL Editor (Mac) - Select word left  

Aqua Data Studio 23.2 (macOS) - Format: Cell Size Narrower  

AWS Cloud9 IDE (Mac) - Select Word Left  

Coda for iOS - Select to the beginning of the current word  

Adobe Dreamweaver 20.2 (macOS) - Select word left  

Valentina Studio - Move Word Left Extending Selection  

Aqua Data Studio 23.2 (Emacs layout, macOS) - Format: Cell Size Narrower  

iPad Smart Keyboard - Select previous word  

Nuendo 10 (macOS) - End left  

Sip - Previous color profile  

Salesforce - (macOS)   Select word to the left  

Salesforce - (macOS)   Select word left  

Apple Pages - Extend the selection to the beginning of the current word  

Microsoft Sway (macOS) - Select left, one word at a time