The official version of the rules of unified english braille is held as a pdf file on the iceb website. decimal / fraction line $ dollar sign: colon examples: $ 7. , comma - hyphen. there are 63 possible combinations of raised dots used to represent the letters of the alphabet, numbers, and punctuation. discover a wide selection of entertaining and informational books for children. it was devised by louis braille in 1821 and consists of raised dots arranged in " cells. braille is a tactile system of reading and writing used by people who are blind or visually impaired. get deals and low prices on book in braille on amazon. associated document: unified english braille guidelines for technical material available for download from the iceb website) rules of unified english braille iii. it uses characters formed by combinations of six embossed dots that are arranged within the braille cell in two vertical columns of three dots each. print and braille versions of the rulebook may be downloaded from there. edu © hadley institute for the blind and visually impaired. a simple braille character is formed by one or more of these dots, and it occupies a full cell or space. braille numbers numeric indicator 1 2. invented by louis braille, the system is based on a matrix of six raised dots, arranged in two columns of three. braille alphabet a b c d e f g h i j k l m n o p q r s t u v w x y z hhadley basic braille hadley. braille pdf " a cell is made up of six dots that fit under the fingertips, arranged in two columns of three dots each. braille is a system for tactile reading and writing. braille is a system that enables blind and visually impaired people to read and write through touch.