Swann onscreen icons... bell, movie... construction?

does anyone know of a general info page about Swann DVR/NVR systems? I have a 7090 and a friend of mine has the 7200... I know the bell is the icon for an alarm, and the red motion picture reel/clapboard is for motion detected - but i have an icon showing which looks like a construction barrier. like a saw horse if you will, but the top is black and yellow striped. i can see the camera when at full screen but not on multi-view and i'd love ideas as to why, and would like to think the icon is a hint to the cause.

anyone know of other icons i should look out for?

The "red motion picture reel" indicates it is recording, not "motion detected".