Depends!
My sister-outlaw and my partner (her big brother) are 3a. His corkscrew curls start at the scalp, and he'll have multiple visible corkscrew curls in any hair that gets more than about 3" long. His hair is pretty coarse, so he can really do whatever he wants and the curl will be there. Hers take a bit longer to form (maybe 6" to get multiple wavelengths?), but are somewhat tighter. Her hair is more a medium texture tho, so it's easy for the curl to pull out into waves.
In terms of look, 2c would be a reasonable type for her in many circumstances. But... it doesn't provide a good picture of how much moisture her hair needs, or how gentle she needs to be in handling it.
For both of them, curl is somewhat limited by other factors. Psoriasis sucks :P. And it sucks worse on your scalp.
As a rough guide, if the dominant impression is corkscrews or ringlets, I'd lean towards a 3a. Or if the dominant thing your hair wants from a regimen is tons of moisture, I'd lean towards 3a. If your hair tends to have a more even mix of waves and corkscrews, or if the curls reliably pull out no matter how gentle you are and no matter how much you pamper them with moisture, I'd lean towards 2c. And definitely if you're looking at such a small number of corkscrews curls that it's worth counting them, 2c.
There's also nothing wrong with a 2c/3a type if you really can't figure it out. The curl descriptor is helpful for figuring out a routine, but it's normal to find that your curl descriptor was wrong wrong wrongity wrong. My sister-outlaw kept trying to tell me she was 2a or 2b. And I thought I was 1a.
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