It indicates where you can find an Automatic External Defibrillator (AED) – and, in some situations, knowing that could help to save someone’s life.
But I’m far from an expert on anything about this topic. Please go read Huffygirl’s post at http://huffygirl.wordpress.com/2012/03/12/save-a-life-learn-cpr/ to find out more about AEDs and CPR and why everyone should become familiar with them.
Meanwhile, I’m planning to take the next basic CPR course offered in my area. So now you know where I’ll be the first Tuesday evening in May.