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Disability Reference Libraries

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Braille
2010-09-23 19:56:17

The Braille system is a method that is widely used by blind people to read and write. It was devised in 1821 by Louis Braille, a blind Frenchman. The Braille characters are made up of six dot positions arranged in a rectangle containing two columns of three dots each. Including a subset when dots are not raised, there are sixty-four possible subsets. The positions on the grid are number 1-3...

Word of the Day
negawatt
  • A unit of saved energy.
Coined by Amory Lovins, chairman of the Rocky Mountain Institute as a contraction of negative watt on the model of similar compounds like megawatt.