Sign systems refer to a complex network of symbols, signs, and codes that are used by individuals to communicate and understand information. Synonyms for sign systems include semiotics, symbol systems, communication systems, and language systems. These terms all refer to the way in which people use abstract and visual representations to convey meaning. Another term commonly used to describe sign systems is signage, which refers to the combination of visual and written elements used to communicate information to an audience. All of these synonyms highlight the importance of understanding the complex and nuanced systems people use to communicate with one another.