Which is the name of this kind of font, and how to use it?

I want to type the letter boxed by red box below

And I have tried several methods, such as $mathcal{Y},$ $mathscr{Y},$ but failed. I guess the letter is “Y". How can I type it in tex? I have searched for solution, and found that usage of package mathpazo may help. But it changes all the main fonts of my file.