This area is not friendly to tasking. Or, to put it another way, people around here will accept crazy behavior. Sorry about the bad picture but for some reason I've found it nearly impossible to photograph this. This symbol and it's twin are both adaptions of real hobo signs. If you're having trouble remembering which stands for safety and which stands for not safety, use this simple method: the half circle represents the forces stopping you from tasking, the dot represents you. When the circle's down, it's trapping you in and keeping you from escaping. When it's up it's letting you free.