I can't figure out warning light on dash it's a box with a bit of slant on 2006 BMW 325i

square box with taller pole on right side there's something in the middle but I can't remember it and it wouldn't come on just now but it came on two days ago yellow and doesn't show up when I click through the computer service information with spark plugs tires etc

Asked by for the 2006 BMW 325i