I'm looking at an old Excel 2003 file (emailed a year ago by a friend), which has 2 small columns to the left of the row headings (so they are not cell/data columns). In the first column (with the heading "1"), there's a bracket covering data rows, and in the second column (with the heading "2") there is a bullet/dot for each row covered by the bracket.
What do these columns and marks indicate?
Note: The workbook is protected, but not all worksheets in the workbook contain the above-described columns.

What do these columns and marks indicate?
Note: The workbook is protected, but not all worksheets in the workbook contain the above-described columns.
