KP. It is what they called the Pilsbury Doughboy when he was little
If you light the candle from both ends and spend all weekend studying by the end of the weekend what ever is left of the candle will most likely be a doji.
I like to think about it as the door between two kids. One is pushing from one side the other is pushing from the other. The door doesn't move.
It suggest that all the buyers and all the seller have agreed on a price at this point and often that is a sign that a change of direction is about to happen.
A little more weight behind either side of the door will move the door.
With boy-girl twins Rule number one in this house has always been, "Don't fight with doors." Because someone is going to get hurt.