nyctography
jig tool and substitution cypher invented by Charles Lutwidge Dodgson (alias Lewis Carroll) for writing by feel
Summary
Nyctography is a form of substitution cipher writing created by Lewis Carroll in 1891. It is written with a nyctograph and uses a system of dots and strokes all based on a dot placed in the upper left corner. Using the Nyctograph, one could quickly jot down ideas or notes without the aid of light. Carroll invented the Nyctograph and Nyctography as he was often awakened during the night with thoughts that needed to be written down at once, and didn't want to go through the lengthy process of lighting a lamp only to have to then extinguish it.
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