The document discusses key concepts in semiotics and sign theory, including:
1) It defines semiotics as the study of signs, symbols, and signification, or how meaning is created.
2) It discusses seminal theorists like Saussure, Peirce, and Bense and their contributions to defining signs and the relationships between signifiers and signifieds.
3) It outlines the three main types of signs - icons, indexes, and symbols - and gives examples of each.
4) It explains Saussure's theory that the relationship between a signifier and signified is arbitrary and established by social convention rather than any inherent link between the two.