I saw this in a video showing a scene from the History channel on TV. It was on a T-Shirt that was worn by a male mannequin. As far as I remember, this is from some sort of open-world game. I tried google searching it, but found no results for it.
What game is this symbol from
game-identification
Related Solutions
Via a reverse image search of this piece, I found the game.
It's called Battleheart (Google Play link | IOS Appstore link).
It's a unit from the tower defence game.
Best Answer
It is the logo/symbol of the Enlightened, a faction in Ingress
The color of the Enlightened is usually green, while the color of the opposing faction, the Resistance, is blue. The color of the logo on the T-Shirt is quite ubiquitous in Ingress, though.