For over 30 years, Tobii Dynavox Picture Communication Symbols® (PCS) have been used by millions of students and adults to understand and structure the world around them, communicate their thoughts, and learn to read and write. Symbol-based visual supports have been proven to help people with communication and learning challenges succeed in school and in life. All designed to better fit your students' specific learning and communication needs, there are 4 different types of PCS: Classic, Thin line, High Contrast, and In-Context. PCS are available for licensing to anyone wishing to use these popular symbols.