man page section titles for ell and en

The man page for 'man(1)' lists titles for nine man page sections:
  1. FreeBSD General Commands Manual
  2. FreeBSD System Calls Manual
  3. FreeBSD Library Functions Manual
  4. FreeBSD Kernel Interfaces Manual
  5. FreeBSD File Formats Manual
  6. FreeBSD Games Manual
  7. FreeBSD Miscellaneous Information Manual
  8. FreeBSD System Manager's Manual
  9. FreeBSD Kernel Developer's Manual
But the man page, in listing the default for the -S switch, hints at two more sections: l (ell) and n (en). Sure enough, those sections do exist. What's in them is entirely unfamiliar to me. What would be fair titles for those two other sections?
 
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