That's really not enough to go off of. You haven't really given any context, such as where you saw it in terms of either what country/city or what kind of wall. You didn't specify if it was printed, painted, handwritten or what. Is the dot under the top A-shaped thing part of it? Can you re-draw it more exactly as it was originally?

We're missing almost everything that would be helpful in working out what you saw. Can you offer anything else?