Tone indicators, formed with a slash and one to three letters (e.g., /j for joking, /hj for half-joking, /srs for serious) and inserted at the end of a comment, developed in various online communities of young people as a way to be inclusive of neurodivergent people, who often have difficulty interpreting subtle clues. But they address a problem most of us have had at some point. – The New York Times