You are referring to the error checking functionality. The green triangle
indicates that the cell meets one of the error situations you are set up to
check for. You can go to ToolsOptionsError Checking and select or unselect
different conditions to check for. You can also turn of error checking on
the same screen.
Hope this helps.

"Annie" wrote:

Hi

Sometimes while using Excel 2003 I find that the cell is marked with a
little green flag, on the bottom lefthand corner of the cell, much like the
red flag that indicates a comment. Can anyone explain to me what this is and
what is its purpose?

Many thanks
--
Kind regards

Ann Shaw