macos - Unusual Size value displayed in Finder; meaning of

While investigating an issue of iCloud failing to sync on my iMac I noticed a couple of unusual things in Finder. In the "Size" column some values were preceded by an upward-pointing or downward

Is it possible to show an image dimension column in the list view

How to resize the Finder column view in OS X - CNET

filesystem - Why does Finder give several different sizes in Get

How to Give macOS Quick Look New Powers

How-To: Show the size of folders in the Finder on Mac [Video

Change how folders are displayed in the Finder on Mac - Apple Support

How to customize the Finder Preview Pane options on Mac

macos - How can I show the Dimension column in Finder? - Ask

How to take control of macOS Finder window sizes

Using Finder Views on Your Mac