What does the abbreviation RR HTD IND mean on a fuse box diagram inside an automibile?

I had the same question, as well as many other related ones. After a little research, I finally came across a diagram from a 2002 Hyundai Sonata Owner's Manual. It means "Rear window defroster, Outside rear view mirror heater."

Here's where I found it, on page 6-21 (Adobe page 149.) Page 6-20 (Adobe page 148) has descriptions for the under-the-hood junction box, too.

http://www.hmaservice.com/files/407/5001988/A38O-EU14A.pdf

Hope this helps.