You most likely ask about Braille.
The Braille system is a method that is widely used by blind people to read and write. Braille was devised in 1821 by Louis Braille, a blind Frenchman. Each Braille character or cellis made up of six dot positions, arranged in a rectangle containing two columns of three dots each. A dot may be raised at any of the six positions to form sixty-four (26) possible subsets, including the arrangement in which no dots are raised.
Sladecolour produces a set of buttons designed for the blind and visually impaired that help to relate color to touch. The buttons match 16 colors each to their own unique shape. The buttons can be attached to canisters and containers to identify their contents or sewn to clothing to assist in putting together a color coordinated outfit.
It is used by blind people.
No. It was used by blind people.
They used buttons.
Braille
braille
so blind people can read.
For blind people to read.
Finger spelling, or signing, is used by blind people.
they used buttons OF COURSE DUMMY
Buttons can be used for many different things. On clothing, buttons are used to close on opening. One remotes, buttons are used to change channels and adjust the volume.
Well as people think bats are blind because they often bump into people they acually see better than people. As people thinking bats were blind for many years people used the phrase even after science proofed bats weren't blind! They told it to people who were clumsy or needed glasses!