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An orange circle with an exclamation mark in it.
Most likely it's tire pressure.
According to my 2000 Sienna manual, an exclamation point in a circle with 2 parens on either side is a brake system warning light. Might want to get your brake system looked at.
One of your headlights have burned out.
Power
The red exclamation point in a circle is the parking brake indicator.
Low tires.
low tire warning
The warning light in the bottom area of your tachometer that looks like a circle ( gear ) with an exclamation mark in the middle is your " check transaxle " ( transmission ) warning light . If the light stays on take your vehicle in for servicing
low tire pressure if it is the upside down half circle, kinda like a U with an exclamation.
look in your owner's manual
Exclamation point in a circle: handbrake is setExclamation point in a slice of a tire: tire pressure is low