I don't know how popular this book is in Russia (I was told you guys read it in school but that could be wrong) but I was hoping yall could help me understand the significance of the letter Ю in the novel. My knowledge of Russian isn't good enough to understand why this letter in particular took on meaning.
I suspect there is no reason why but I just want to make sure im not missing anything important.

What is the special significance of the letter Ю in this book?
My knowledge Russian isn't good enough to understand what the hell is going on here.