Used for telegraphy, too. I recommend reading "The Victorian Internet" by Tom Standage. https://www.unicode.org/L2/Historical/Unicode-Telegraphic-PhraseBook.pd

Used for telegraphy, too. I recommend reading "The Victorian Internet" by Tom Standage. https://www.unicode.org/L2/Historical/Unicode-Telegraphic-PhraseBook.pdf https://www.unicode.org/L2/Historical/Unicode-Telegraphic-Ph... is an example but from what I've read there were massive volumes that included all sorts of specific stuff. Companies coming up with their own codes to save on telegraphy costs were cool, code books with random letters smooshed together. Obviously telegraph operators had trouble with this, reducing their pace so telegraphy companies banned usage of non-words in telegrams (more on that in the book I mentioned).