Newb Question What is this dash light?

I'm going to check out a 2004 Toyota Prius tomorrow and most likely buy it. It has a smartkey, nav, bluetooth but i'm not sure which package it would be. Anyways, while reviewing the pictures from the owner that they sent over i saw this warning light and i can't figure out what it might be. I can't post the picture on here since I'm new and cant post image's yet until I've made 5 posts...but its a yellow one slightly above the computer. It's not a low fuel light either..it appears to have an icon in the middle with / \ on each side of it. And its not the red door open icon either..Any ideas/help?

I know I could just ask the owner and i'm gunna do that tomorrow when i see it in person..just wanted to research it a bit before I saw it.

 

That would make sense since we're in Chicago and its below arctic out here. Thanks!