Often implying a 24-bit/96-kHz or higher "Master" quality.
In audio circles, the number "11" often refers to the concept of "turning it up to eleven"—a metaphor for pushing equipment or volume to its absolute limit. In the context of a file name like "Imagine Dragons - Warriors -FLAC- 11," it typically signifies: Imagine Dragons - Warriors -FLAC- 11
In an MP3, the quiet intro and the loud chorus are often "leveled out." FLAC preserves the "11" (often referring to maximum volume or high-bitrate intensity), allowing the crescendos to feel truly powerful. Often implying a 24-bit/96-kHz or higher "Master" quality