Based on your description of having thick wavy hair that forms a U shape when it curls, it sounds like your hair may fall under the 2B category.
2A hair tends to be fine and has loose waves, while 2B hair is thicker, with more defined waves that often have a bit of frizz and can have a more pronounced “S” or U shape when curled. Since you mentioned that your hair is thick and has a more distinct wave pattern, 2B is the more likely classification.
Keep in mind that hair can also have characteristics of multiple curl types, so it's possible to have features from both categories.
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