I also had another idea a long time ago similar to this re-steem symbol well actually it's the same sign. But I'm speaking of automobiles! Yes, automobile companies need to add what I call this, a "U-Turn" Signal to notify other drivers that you will be making a U-turn.
You see, some people end up damn near hitting others from the rear due to not knowing if the person in front will be making a quick U-turn on a turning lane. This symbol(resteem) should be of help to warn others ;)