The yellow symbol you're seeing in your 2009 Toyota Matrix, which resembles an exclamation mark within a half circle, typically indicates a warning related to the vehicle's braking system or general vehicle safety. It may signify issues such as low brake fluid, a malfunctioning brake system, or that the parking brake is engaged. It's important to check your owner's manual for specific details and to address the warning by having the vehicle inspected if necessary.
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 tire warning
Low tires.
low tire pressure if it is the upside down half circle, kinda like a U with an exclamation.
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
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