Show Symbol Indicator
TECHNICALLY this is not an indicator. Yesterday, we posted an indicator that has symbol for AAPL drawn in the lower left hand corner. This indicator helps when I look at the screens from across the room.
Trading can be boring sometimes, so you may not be sitting directly in front of your monitor when something interesting.
The menu bar has the symbol, or course, but sometimes it is just easier to glance at a screen and see what it is. Of course, this one is free over at TraderWerks.