/boot/System.map-*
This wiki page is about a path or a file in the Linux file system. Be bold and improve it! Describe its purpose and its use, which program created it and uses it, which configuration settings it might be dependent on, and which Linux distributions typically have this file by default while others might not.
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Regarding the various System.map-* files that you may see in your /boot/ directory, here is a post that very clearly explains what they are and why they may be useful, answering the following two questions:
What Is The Kernel Symbol Table?
What Is The System.map File?
http://www.dirac.org/linux/system.map/
Simply delete the System.map files corresponding to past kernels that you do not use anymore, keep the other ones.
Other resources:
https://en.wikipedia.org/wiki/System.map
https://kernelnewbies.org/FAQ/System.map