mbadros·4 anni fa·discussI thought the story was that Heisenberg did not know either where the exam was, or when the exam was. :-)
mbadros·4 anni fa·discussPerhaps the initials of the person who typed it. In most business contexts at the time, something like "ABC/jed" at the end meant a secretary/assistant with initials "JED" typed something for a manager/employee with initials "ABC."