Helping to Better Understand AAC Symbol Systems

Core vs. Fringe Vocabulary in Symbol Systems

Understanding how AAC symbol systems organize language is essential when choosing or customizing visual supports. AAC vocabulary is generally split into two distinct categories: core vocabulary and fringe vocabulary.

• Core Vocabulary: High-frequency, versatile words that make up approximately 80% of what we say every day (e.g., go, want, stop, more, help, in, on, I, you). In high-quality AAC symbol systems, core words remain in fixed, predictable grid locations so children develop motor memory over time.

• Fringe Vocabulary: Context-specific nouns and verbs that apply to specific activities, locations, or interests (e.g., swing, cracker, slide, dinosaur, math). Fringe symbols are typically swapped or updated based on the environment.

When designing low-tech tools, pairing consistent core AAC symbol systems with environment-specific fringe words ensures children can express themselves across home, classroom, and community settings. Learn how this core-first approach supports early language in our comprehensive parent guide on communication boards for kids.

Selecting the Right Symbol System for Autistic Learners & Sensory Needs

Every child processes visual information differently. For autistic learners and children with visual or sensory processing differences, symbol selection goes far beyond aesthetic preference—it directly impacts readability, cognitive load, and visual processing speed.

When evaluating AAC symbol systems for sensory-sensitive communicators, consider:

• Visual Clutter & Contrast: High-contrast symbols with high-saturation borders help children isolate individual icons without feeling visually overwhelmed.

• Symbol Transparency: Concrete pictographs (e.g., a real photograph or clear drawing of a ball) require less cognitive decoding than abstract line drawings, making them ideal for early communicators or during moments of high frustration.

• Predictable Organization: Maintaining consistent background colors based on parts of speech (such as the Modified Goossens’ color-coding system) helps children locate symbols quickly during high-energy or stressful transitions.

For children who experience visual fatigue or emotional dysregulation, symbol clarity directly supports self-advocacy. Discover how targeted visual supports help prevent meltdowns and support self-regulation in our article on emotional balance boards.

Standardizing Symbol Systems Across School & Community Spaces

One of the biggest hurdles AAC users face is symbol inconsistency between environments. If a child uses one set of AAC symbol systems at home, a different visual board in the classroom, and an entirely different set of icons on the playground, their learning curve slows dramatically.

When schools, parks, and therapy clinics utilize standardized AAC symbol systems, children transition seamlessly between learning and play without having to relearn icon meanings.

• In Classrooms: Consistent grid layouts allow teachers and paraprofessionals to model language effortlessly across academic subjects.

• In Outdoor & Civic Spaces: All-weather visual supports placed near playground equipment, splash pads, or park entrances give children immediate access to functional communication with peers.

To see how districtwide symbol consistency transforms student outcomes, explore our case studies on communication boards in schools. You can also discover how visual supports foster inclusive play in our guide to playground communication boards.