Mac Mini does not boot, shows only strange symbols instead [duplicate]

These prompts are meant to get you to connect the mouse or trackpad that ships with Apple hardware and I presume they chose pictures of the Bluetooth gear since they wanted this to work before the language localization is established. This can also get displayed when there is a firmware or major system/security update. In rare cases, you cannot use screen sharing to bypass this - a physical pointing device is required unless you have MDM supervisory control over the device.

If you connect any USB keyboard and Mouse, you can proceed to set up your Mac.

https://support.apple.com/guide/mac-mini/welcome/mac

After you connect a display, keyboard, and mouse or trackpad, press the power button on the back of your Mac mini. Follow the Setup Assistant prompts, and you’re up and running.

Set up your Mac mini

If for some reason you have already connected a keyboard and mouse, there may be a hardware error.