This is about an intel Mac right?
A globe with an exclamation point means that your Mac tried to start up from macOS Recovery over the internet, but couldn't.
For intel MacBooks follow these instructions
If you see the globe and alert symbol, try these solutions:
- Make sure your Mac can connect to the Internet. If you aren’t prompted to choose a Wi-Fi network during startup, choose a network from the Wi-Fi menu , if available.
- Press Command-R at startup to try using the built-in Recovery system instead of Internet Recovery.
- Connect to the Internet using Ethernet instead of Wi-Fi, or vice versa.
- Connect to the Internet from a different Wi-Fi or Ethernet network. Your network configuration may not allow the Internet access that macOS Recovery needs.
- Try again later, because it may be a temporary issue.
- Start up from another disk or volume, if available, or use a bootable installer to reinstall macOS.
If you still need help, please contact Apple Support.
See this link if you have a MacBook with apple silicon
Use macOS Recovery on a Mac with Apple silicon – Apple Support (UK)