SAY

  if you type this command followed by any amount of text, people in the room
  will 'hear' you saying that.  for example, if Fnord types
    say hello
  then everyone else in the room will read
    Fnord says, "hello"

  the shortcut for this is to just put a quotation mark followed by what you
  want to say:   "hello   is the same as    say hello