Its the parking brake light.
Warning light symbols on the dashboard of a vehicle warn of problems to the driver. For example, the warning light symbol of an exclamation on a Lexus 350 dashboard means the tire pressure is low.
it means that the handbrake is on
It means there is a problem with your transmission.
Hazard lights (flashers)
What does the triangle with exclamation point light mean in 2006 Lexus Gs 300
It's the TPMS warning light. "Tire pressure monitoring system"
You probably have a light bulb burn.
what is the green p warning light on lexus is250
low tire pressure if it is the upside down half circle, kinda like a U with an exclamation.
tire pressure
does it have two yellow lines surrounding it? kinda circling it? if so that's your tire pressure light
From what I know (doing my own troubleshooting). It means you need to take it in to get your brake pads replaced.