You drive vehicle often, do you know what this symbol means?

It is a warning for the TPMS lights up when one or more of your vehicle’s tires is 25% below the manufacturer’s recommended pressure.

What is TPMS?A Tire-pressure monitoring system (TPMS) is an electronic system designed to monitor the air pressure inside all the tires(filled with gas or air) on automobiles.

The issue here seems to be that the public hasn’t been properly educated on the warning symbol, which is supposed to be “idiot proof” and understandable across a wide variety of cultures and languages. Yet 46% of drivers couldn’t figure out that the icon represents a tire and 14% thought the symbol represented another problem with the vehicle entirely, according to Schrader.

Very important point that I found here is "Low pressure will affect your braking, acceleration, stability, cornering and fuel economy".

Source: http://autos.yahoo.com/articles/autos_content_landing_pages/1498/do-you-know-what-this-symbol-means