braille vs nubbins

braille

noun
  • A system of writing in which letters and some combinations of letters are represented by raised dots arranged in three rows of two dots each and are read by the blind and partially sighted using the fingertips. 

adj
  • Of, relating to or written in braille. 

verb
  • To write in, or convert into, the braille writing system. 

  • to identify something by touch. 

nubbins

How often have the words braille and nubbins occurred in a corpus of books? (source: Google Ngram Viewer )