In the early 90's ASCII art became a thing. It was a way to make logos using regular ASCII characters to decorate readme files and add some branding. Nowadays we can generate these banners using free tools like Text to ASCII Art Generator. It can be used to create a server login banner that is displayed each time people log in via SSH.
First generate a ASCII logo with the Text to ASCII Art Generator. Then open up message of the day file
sudo nano /etc/motd
Add a text such as
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
______ _ ______ _
| ___ \ (_) | _ \ | |
| |_/ /_ _ _ ___ _ __ | | | |__ _| |_ __ _
| __/ _` | |/ _ \| '_ \ | | | / _` | __/ _` |
| | | (_| | | (_) | | | | | |/ / (_| | || (_| |
\_| \__,_|_|\___/|_| |_| |___/ \__,_|\__\__,_|
Save the file and open a new SSH session and log in, we should be greeted with our beautiful banner