Is "the Man Without Fear" just a marketing term for Daredevil, or does it reference something?

I'm fairly well-versed with comics lore, but I'm not very familiar with Daredevil. I know his basic powers/abilities, but I'm interested in learning more in the run-up to the new Netflix show.

One thing I've noticed is that Daredevil is often referred to as "the Man Without Fear." Now certainly, Daredevil is quite brave, but from what I can tell he's not particularly brave relative to Captain America or Spider-Man or any other A-List Marvel hero.

Is that line just a catchy subtitle, like "the Caped Crusader" or "the Man of Steel", or does Daredevil have some special relationship with overcoming fear that I haven't come across yet? At least Batman and Superman's subtitles give interesting information about the character: Batman is on a moral quest to stop crime, Superman is incredibly strong and tough.

Surely Daredevil isn't literally incapable of feeling fear? That would be dangerous, and would undercut a lot of narrative drama. But otherwise, calling a superhero "the Man Without Fear" seems like calling a superhero "the Man Who Fights Bad Guys!" Not terribly unique...

Is there some reason why Daredevil deserves the title "the Man Without Fear" more than any other hero?