Shelf (computing)
The Shelf is an interface feature in NeXTSTEP and OPENSTEP, and is used as a repository to store links to commonly used files, directories and programs, and as a temporary "holding" place to move/copy files and directories around in the file system hierarchy. In macOS, items may be dragged onto the sidebar area of the Finder, but these do not behave as placeholders and cannot be manipulated in the below manner.