Which mathematical product design innovation was specifically created to make mathematics accessible to blind students and later became widely used by sighted mathematicians as well?

The design of mathematics education products has evolved significantly over the centuries, from simple tools to sophisticated digital platforms. This poll tests your knowledge about a groundbreaking product design innovation that revolutionized mathematics education and accessibility. Consider how product design in educational tools has transformed the learning experience for mathematics students worldwide.

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Braille mathematical notation system
Abacus with color-coded beads
Mathematical speech recognition software
Tactile geometric drawing boards