It's pretty much a red box with a bump on top, with a wavy line inside and an arrow pointing down above that line. I'm guessing it means some sort of fluid is low but I can't tell. Here's the crappy MSPaint rendition I promised:
I havent really used my LJ in a long time so I don't know if I still have email notices on, but if someone who knows the answer comments or could send me an email to firstname.lastname@example.org, I'd really appreciate it.
:EDIT: Problem solved, uoftsaturnguy sent me a prompt email, and it's the coolant being low. Many thanks to him for his help.