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Six principal systems of embossed type in use c. 1900: Haüy, Gall, Howe, Moon, Braille, Wait
Six principal systems of embossed type in use c. 1900: Haüy, Gall, Howe, Moon, Braille, Wait

A tactile alphabet is a system for writing material that the blind can read by touch. While currently the Braille system is the most popular and some materials have been prepared in Moon type, historically, many other tactile alphabets have existed:

See also Vibratese.

See also

http://abstracts.iovs.org/cgi/content/abstract/46/5/4590