“* the highest cat≠egory is a ìlineî, which could be CON, AUX or VTY.”

Since the post is all about being politically correct, don’t forget TTY

* the highest category is a “line”, which could be CON, AUX or VTY.
* the “line” probably appeared before IceAge3, when all terminal-like devices were connected to the router with physical serial lines (I would suspect VTY was a later addition to Cisco IOS).
* “terminal” is a temporary per-session instance of a line. That’s why you change per-session settings with “terminal X” and permanent settings in “line” configuration mode.
* “monitor” is a “line” which monitors router operations … which actually means the SYSLOG messages are sent to it.

And, BTW, “line printer” refers to those devices that printed a whole line at a time (as opposed to typewriters or dot matrix printers which printed a character at a time). The “line printer” would have to receive a whole line and then optimize the operation of its printing chain (or drum) to print the line as quickly as possible.

Hand-optimized character sequences generated varying level of noise (the most noise was generated when all hammers struck the printing chain at the same time), which allowed clever programmers with nothing better to do to play Radetzky March on the line printer.