About Grace Hopper's moth: the notes in her logbook say "First case of actual bug being found." Meaning that the term "bug" meaning an error or glitch was in co

About Grace Hopper's moth: the notes in her logbook say "First case of actual bug being found." Meaning that the term "bug" meaning an error or glitch was in common use even when she found the moth. "Bugs on the line" was a term used to refer to transmission errors, often due to unauthorized operators, in the telegraph days.