fonts-firacode software package provides Monospaced font with programming ligatures, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fonts-firacode
fonts-firacode is installed in your system.
Make ensure the fonts-firacode package were installed using the commands given below,
$ sudo dpkg-query -l | grep fonts-firacode *
You will get with fonts-firacode package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Fonts |
| Package | fonts-firacode |
| Version | 1.203-1 |
| Description | Monospaced font with programming ligatures |
| Sub Section | Fonts |