Something that I've been noticing more and more frequently is that sometimes writers will say something and then say (read: something else). For example (made up sentence to the best of my knowledge):
Jane Foster was upset that Thor didn't try to stop the men who borrowed (read: stole) her high-tech equipment.
A basic Google search did not turn up any relevant examples from before computers, but I was wondering when this practice originated. Also, why wouldn't you just say what's in the parenthesis instead? (Not sure if that should be a separate question).