I heard a french player say it in a stream yesterday, and as @mekriff says, Inseong Hwang calls the shape a scorpion shape in 3-3 invasion type joseki.
The first two are from playing 3-3 point openings and the opponent letting me get an outside hane (kind of big and mini scorpions 
)
The 3rd one is more properly from a 3-3 invasion where much later I was chancing my arm trying to live, and the atari was not the right move in this case.