Long story short... back to the age of #telegrams... the basic message had a default word count of ten... so if you added "#code #words after your message you could communicate much more complex ideas. My personal favorite...
"Jab" = "The servants have left, the house is on fire, all the children have smallpox, and I have lost a filling out of my tooth… but don't think of hurrying home."
For much more from the book "The Private Code and Post-Card Cypher" by C & B Johnson (1914)...
https://richard.rathe.org/books/bookhouse/telegraph_codes_1914/index.html