sentences:  TriMet discontinued use of the distinctive graphic symbols used at mall stops at that time, but the symbols had already been relegated to secondary status in 2002, when they were replaced by purely geographic, letter designations such as N or NE (for North Portland or Northeast Portland) for each grouping.The graphic sector symbols were retained only at a greatly reduced size on the mall signs (much smaller in size than the new letter indications) and were no longer used at all in other TriMet media, such as the covers of bus schedules.They disappeared entirely in January 2007.