1 Yes, Yufei is homophonic with "Yifei", and netizens often call it "Yifei".

2 This is because "NAND" is a type of logic gate in circuit science, and "NOT" itself also means "not", which is often used to mean "dislike" or "dislike" in Internet slang. It has meanings such as "objection", so it is similar to the pronunciation of "and not", and has become an Internet slang.

3 has become an Internet cultural phenomenon, not only a joke and ridicule, but also represents the development and evolution of Internet language and Internet culture.