Guidelines for Braille characters and relief symbols.
Specific contrast ratios, font sizes, and placement heights. gost r 52131 2003
📍 You can find the full text or purchase the official document through the RussianGost Regulatory Library . RussianGost|Official Regulatory Library - GOST R 52290-2004 Guidelines for Braille characters and relief symbols
Compliance with GOST R 52131-2003 is a core part of the "Accessible Environment" program. It ensures that: gost r 52131 2003
Information is legible for those with low vision through .
Materials must withstand environmental wear and vandalism.