The document discusses semiotics in three music videos: 1) BTS' "Spring Day" uses shoes tied in tree branches to symbolize someone who has died in the lyrics. This symbolizes the spirit returning to walk closer to heaven. 2) SUD's "Sila" uses a cigarette passed between two people as a symbolic goodbye kiss to end their secret relationship, as well as representing the danger and sins of the relationship. 3) Pharrell Williams' "Happy" features a cat design on a shirt iconically, simply representing a cute design rather than symbolizing something else.