Why is 1080p called full HD?

Related questions

1. Is HD 1080p better than HD 720p?
2. What is an HD photo?
3. What is standard HD?
4. What is a high quality photo?
5. How can I download HD images?
6. How do I make my wallpaper smaller?
7. What is the resolution of HD 1080p image?
8. How do I download wallpapers?
9. What qualifies HD?
10. How do I change my lock screen wallpaper on marshmallow?

Tags

1. #typical
2. #lines
3. #anything
4. #because
5. #called
6. #broadcast
7. #considered
8. #enough
9. #however
10. #short
11. #answer
12. #1080p
13. #signal
14. #shows
15. #progressively