Open the terminal using a Serif font and a font size equal to 20

A terminal emulator for the X Window System.
More information: <https://manned.org/xterm>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

xterm -fa {{'Serif'}} -fs {{20}}

click the source code to copy install xterm on any operating system with command-not-found.com