MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Braille printer. Hand of a blind person feeling the print-out from a braille printer. Braille is a system of writing that allows blind people to access print. It comprises of a sequence of cells, each of which contains a pattern of raised dots that can be sensed through the fingers. Different patterns of dots represent letters, numbers, punctuation marks and even short words. The printer's buttons (along bottom) also have braille characters.
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