A friend of mine majors in math. He is confused about the symbol ℘ appearing in Complex Analysis written by Elias M. Stein and Rami Shakarchi. He tells me that it can be considered as "P" in some essays, relating to Weierstrass's elliptic function. I am really interested in what ℘ is. It seems to be quite different from the normal alphabet "P". Is it merely a symbol? Or an alphabet? Or something else? Please tell me. My friend and I are both eager to know more about it. Thank you!

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