Details on priority symbols for inbox

I have doubt in symbols which appear in the Importance(I),Priority(P) & Attachments(A) columns in Inbox view. If anybody sends ToDo, there I find lot of different icons. Where can I find details? Please help me in this regard.
In the Notes Designer Help database, look for the help document titled, "Displaying an icon in a column"

This was first published in March 2002