man pages section 3: Library Interfaces and Headers
    
N
 
 ndbm -- definitions for ndbm database operations ( Index Term Link )
 
 netdb -- definitions for network database operations ( Index Term Link )
  Default ( Index Term Link )
  Standard-conforming ( Index Term Link )
 
 network services library -- libnsl ( Index Term Link )
 
 nl_types -- native language data types ( Index Term Link )