The dotty type (7)

I believe the answer is:

braille

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'the dotty type' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?

This is all the clue.

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(Other definitions for braille that I've seen before include "Bumps felt" , "Touching letters" , "System of writing for the visually-impaired" , "Language read by touch" , "Liberal (anag) - reading system" .)

I've seen this clue in The Globe and Mail.

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