I think you mean LH. “Luft” is the German Word for “Air.” Hansa isn’t really a word but connotes a “league,” like the historic Hanseatic League. Lufthansa is a compound noun that sort of means “Air League” or “airline.” I’ve found their service pretty good. They are the national airline of the Federal Republic of Germany. Germany is a NATO partner and close ally of the United States.
It sounds like you purchased a ticket plated on Lufthansa stock. Your ticket probably starts with the numbers 220. United’s request for a copy of the receipt will help them research the issue of the missing miles.