Braille Rules, Codes, Guidelines
BANA (Braille Authority of North America): www.brailleauthority.org – Codebooks and Guidelines for the United States for many topics, including Formats, Early Learning materials, Music Braille, Nemeth Code for mathematics, Foreign Languages (within the U.S.), and Tactile Graphics standards.
ICEB (International Council on English Braille): www.iceb.org – Codebooks and Guidelines for Unified English Braille, including it’s use in Technical Materials.