Somewhat related: I often say that CLIs are GUIs. Letters are pictures to which we've assigned meaning, just like icons. They are just simpler and less ambiguou

Somewhat related: I often say that CLIs are GUIs. Letters are pictures to which we've assigned meaning, just like icons. They are just simpler and less ambiguous, and we're all taught a standardized usage from a very early age to the point that it becomes embedded in our brains for highly efficient processing.