This is one command that I usually forgot the name, as we don’t use it daily.
PURGE = remove a group of unused item (or people in other context) from an organization or place via cleansing process.
There are times when our AutoCAD file become very heavy due to lots of blocks and formatting setting. One way to lighten our files is by purging unused blocks or formatting style. Picture above show list of item that can be purge. We can purge individual items or simply select Purge All if we want to remove all.