If you learn the Braille alphabet, you've essentially learned uncontracted Braille, aka 'grade 1 Braille.' This type of Braille takes up a LOT of space on a page.

#ContractedBraille has contractions, short forms, word signs and so forth to let more words be conveyed in this #monosized, #monospaced print environment.

This link leads to a handy summary chart (but doesn't reflect all the additional rules that may apply):

https://www.duxburysystems.com/braillechart.asp

#Duxbury
#Braille

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UEB Braille Chart from Duxbury Systems

UEB Braille Chart from Duxbury Systems (the makers of Duxbury DBT) showing UEB braille contractions available to Download via pdf file