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Symbols - overview and sources 
Symbols, or picture symbols, are a powerful support for communication. They can be used to:
Support communication at any level of ability through the use of:
Picture exchange;
Communication books;
Communication boards;
High tech and low tech electronic communication aids;
Create visual timetables to show the timetable/routine during the day;
Support reading.
There is a variety of commercial and non-commercial software available.