That's a good question. I don't know the answer, as I'm pretty new to all this curly terminology.
I have mostly S waves with some big spirals underneath and some loose pencil-thin corkscrews throughout. I had been thinking 2b with some 3a, but I may actually be a 2c. In any case, it doesn't stick out from my scalp and instead sits against my head/neck. Since switching to HCC as my shampoo and following the drying instructions in Curly Girl, it has in only a few days begun to show more curl definition and hold.