The Unified English Braille Guidelines for Technical Material were written and published by the International Council on English Braille. They explain the use of Unified English Braille for technical materials such as maths, science and computing.
The 2014 version of the Guidelines provides corrections for some errors in the original 2008 release. A list of errata is available for those who do not wish to print a new copy.
The Guidelines are available for free download from the ICEB’s UEB Project page.