Night writing visited the National Institute for the Blind in Paris, France, where he met Louis Braille. Braille identified the major failing of the code, which was that the human finger could not encompass the whole symbol without moving and so could not move rapidly from one symbol to another. His modification was to use a six-dot cell, the Braille system that revolutionized written communication for the visually impaired. Night writing Night writing, a.k.a. sonography, was a system of code that used symbols of twelve dots arranged as two columns of six dots embossed on a square of paperboard, and is now
DOT (graph description language) DOT (graph description language) DOT is a graph description language. DOT graphs are typically files with the file extension "gv" or "dot". The extension "gv" is preferred to avoid confusion with the extension "dot" used by early (pre-2007) versions of Microsoft Word. Various programs can process DOT files. Some, such as "dot", "neato", "twopi", "circo", "fdp", and "sfdp", can read a DOT file and render it in graphical form. Others, such as "gvpr", "gc", "acyclic", "ccomps", "sccmap", and "tred", read DOT files and perform calculations on the represented graph. Finally, others, such as "lefty", "dotty", and "grappa", provide an interactive