What is an example of a symbol system in AAC?

The correct choice is combining elements in a structured format, as it represents a systematic approach in augmentative and alternative communication (AAC) symbol systems. Symbol systems in AAC are designed to convey meaning efficiently and are often based on structured frameworks that allow users to communicate effectively. This structure can involve organizing symbols, icons, or other forms of representation in a way that users can easily understand and navigate.

In contrast, a series of phrases does not inherently involve a symbolic representation system, as it focuses on language rather than symbols. Using random pictures lacks the intentionality and organization that characterizes effective symbol systems, making it less effective for communication. Finally, creating abstract art does not serve as a communicative symbol system in AAC since it does not follow a defined structure or represent specific meanings that can be universally understood by users. Thus, the option of combining elements in a structured format accurately encapsulates the essence of an effective symbol system in AAC.