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

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

Apple iBooks - Arrow Extend the selection to the end of the current paragraph  

Xcode - Extend selection to the end of the current paragraph, then to the end of the next paragraph (include the paragraph terminator, such as Return, in cut, copy, and paste operations)  

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

Penpot (Mac) - Decrease line height  

Databricks Notebook - Run all commands (inclusive)  

Databricks Notebook - Run all commands (inclusive)  

Reserved Mac - Extend selection to the end of the current paragraph, then to the end of the next paragraph (include the paragraph terminator, such as Return, in cut, copy, and paste operations).  

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

GitLab (macOS) - Command palette  

Mode SQL Editor (Mac) - Copy lines down  

Mode SQL Editor (Mac) - Copy lines down  

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

Signal (macOS) - Next unread conversation  

Guitar Pro 8 (macOS) - One semitone down  

Apple GarageBand - Transpose selected notes down one octave  

Apple Pages - Extend the selection to the end of the current paragraph  

Things (iPad) - Extend selection to the bottom  

iPad Smart Keyboard - Jump to next unread channel  

Microsoft Sway (macOS) - Select down, one paragraph at a time  

Things (Mac) - Extend selection to the bottom  

Microsoft Sway (macOS) - Move the current Card down in the Storyline