You may never have heard of this and neither had I until a player in the Premier League made the gesture during a game.
The Quenelle as it is called is the hallmark of controversial French comedian Dieudonne M'Bala M'Bala, who says it is anti-establishment. It is an inverted Nazi salute and those embracing the gesture have been photograhed outside Synagogues and Holocaust sites.
There seem to be a lot of extremist stories coming from France these days.