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Tire Pressure Monitor System
That message means it is time for an oil change.
Low oil pressure
it means the air pressure in the spare tire under the vehicle is low and air needs to be added.
IF you mean 'what DOES display mean' - display means 'show'
I believe that it means your tire pressure is low.
Either a tire has low pressure, or one of the tire sensors is going bad. The dealer has special tools to diagnose.
As the transmission applies pressure to a section of the trans the oil pressure switch triggers. If you mean a particular switch and what it tells the computer or what it controls I need more background info.
If you mean the difference between a compass and a compass rose: The compass is the complete instrument. The compass rose is the degree wheel printed under the needle.
It means that one of the gauges on not in the safe area, ie overheat, not charging, no oil pressure.....
One of the gauges is out of the safe range, Voltage, oil pressure, temperature, etc
nothing to display