Developed under the Sponsorship of the Braille Authority of North America (BANA). This code is based on the Nemeth Braille Code for Mathematics and Science Notation, 1972 Revision. Since the Nemeth Code does not include symbols and rules for chemistry notation, transcriptions of chemical material have varied greatly depending on the ideas of the individual transcriber. The Mathematics Technical Committee of the Braille Authority of North America felt there was a great need for uniformity. This manual is now the approved braille code for Chemical notation.