Is star spangled banner an abstract noun?

Oh, dude, the Star-Spangled Banner is actually a concrete noun because it refers to a physical object, specifically the American flag that inspired the national anthem. Abstract nouns are more like love or freedom, you know, all those touchy-feely concepts. But hey, if you wanna get technical, the Word "banner" in Star-Spangled Banner could be considered abstract if you squint really hard.