- Many standards for braille math, even within a single country
All of the standards linearize math.
- In the US, Canada, and New Zealand, Nemeth code is the most common
- Other English speaking countries use a considerably different code
- Only 1/3 to 1/2 of math students and teachers learn Nemeth code
Almost no math teachers outside of blind schools know it
- "dots-plus" is an experimental 2D alternative