The Prius has electric power steering. The "PS" in a rectangle means that the computer has detected a problem there. The red triangle with an explanation mark means that the computer has detected a problem with the Hybrid System. Usually it is accompanied by red symbol of an automobile. In any case you should take the car to a dealer who can read the diagnostic codes from the computer and determine the cause of the problem.
If your car stalled after start those warning lights will come on until you successfully start it 5 times then they will go off automatically
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I have a 2001. It also seems that has self detecting ability that display a red symbol. I found out that if you continuing it resolves the problem itself. My displayed a large letters "PS." It was had to steer and there was shuddering in the steering column. After a few miles the light went and it returned to normal.
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