Is there a single symbol showing you favor gun control?

I'm thinking of something that can be displayed in one's car or in one's front house window. For example, a single lighted candle, the electric candles we display at Christmas, lighted year round.

A symbol that can become universal. A way to show the world that, for you, enough is enough?

If there isn't, maybe we can start one. A blue candle, perhaps.

A blue bulb in an electric candle in your front window, perhaps



While I'm suggesting a blue candle, anything will do, just so the meaning is clear and universal.