Who wrote "Single Ladies" and what does the song mean? [DIFFICULT]?

"Single Ladies" is a song by Beyoncé Knowles that was written by Christopher "Tricky" Stewart, Terius "The-Dream" Nash, Thaddis Harrell and Beyoncé Knowles. The song is a statement by Beyoncé that if a man loves a woman, he should marry her; otherwise the woman should leave him.

The phrase "put a ring on it," which is used throughout the song and is the alternative title of the song, is understood to symbolize the promise of an engagement or wedding ring. In the music video for the song, Beyoncé and other dancers are pictured waving their hands in the air to draw attention to the fact that they do not have any rings on their fingers and are therefore single.