Common nicknames include:
The Stars and Stripes
The Star Spangled Banner (name of the national anthem)
(less frequently) the National Ensign
(also from song) the Grand Old Flag
I don't think there is a nickname, love. Google it maybe?
It is usually called "Old Glory" or "The Stars and Stripes."
Semaphore or signal flag.
Any flag could, but it would be disrespectful.
It is the Stars and Stripes.
The American Flag. Stars and Stripes. The Star-Spangled Banner.
It would depend on the height of the flagpole.