Blissymbols are meaning-based symbols which can be used by people with severe difficulties in speaking to communicate without speech.

The system has a large and flexible vocabulary and contains logical rules for expanding vocabulary and grammar. It is particularly useful for people with cerebral palsy and related physical disabilities who may find reading and spelling difficult but who may still require a system of communication that will expand beyond most pictorial symbol systems.

For a more in-depth explanation of Blissymbols see the BCI web site.