[2] The Nemeth Code Book (1972) opens with the following words: This Braille Code for Mathematics and Science Notation has been prepared to provide a system of symbols which will allow technical literature to be presented and read in braille.
The Code is intended to convey as accurate an impression as is possible to the braille reader of the corresponding printed text, and this is one of its principal features.
When the braille reader has a clear conception of the corresponding printed text, the area of communication between himself and his teacher, his colleagues, his associates, and the world at large is greatly broadened.
A test of the accuracy with which the Code conveys information from the print to the braille text is to effect a transcription in the reverse direction.
For example, if the same math symbol might have two different meanings, this would not matter; both instances would be brailled the same.