Autopen is a fancy word for an "old" fashion plotter.

If you are old enough, remember those?

https://cdn.nostrcheck.me/0bfa75091bdf527dc090f06894ccbf7e0bed26953f6bff5c706d5ca84ada41ef/f3f0113d9d5fd18ecf9e53381c00c87010483d0e1c9beea0ca96e42ec985e092.webp