The Trinacria is the symbol of Sicily. It's Medusa in the middle, and for your information, Medusa has been given a bum rap- she's always the bad guy in the stories they tell the kids, but believe me she's not. Which isn't to say that she couldn't turn you to stone, but that's not the whole story. The legs stand for the three corners of the island, but also could stand for kick butt, kick up your heels, and alive and kicking. Or kick off, kick the bucket or kick in the slats. Take your pick.
PS- Medusa is just PO-ed, and she has a right to be. Look it up.