Why does people spray paint a big A with a circle around it?

In my neighborhood on telephone poles or street signs you see spray painted a huge circle with an A in the middle of it. The A is a poorly drawn A that looks like three sticks put together to form an A. On border up houses I see spray painted a circle with an A in the middle of it. Sometimes I see them spray... show more In my neighborhood on telephone poles or street signs you see spray painted a huge circle with an A in the middle of it. The A is a poorly drawn A that looks like three sticks put together to form an A.

On border up houses I see spray painted a circle with an A in the middle of it.

Sometimes I see them spray painted on dollar store Windows.

What the heck does that mean?
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