Braille Pattern Dots-18

It shows dots 1 and 8, not a fixed letter. Dot 1 is upper-left; dot 8 is lower-right. The Braille code for a language assigns the combination its reading.

Charles Barbier's 12-dot “night writing” reached the Paris school for blind students in 1821; soldiers used it to communicate after dark without speaking. Louis Braille's smaller six-dot cell fit one fingertip; he developed it by 1824 and published it in 1829. Later, eight-dot codes added two lower dots for computer and technical text. Unicode records the patterns; each code supplies their readings.