It refers to the ability to locate the source of a sound. It supposes that the localization is achieved only by the difference of the time of arrival of the sound to both ears. That’s why the curve is a hyperbola, which is the set of points which distances to the foci (ears) have the same difference, so you couldn’t differentiate which of all the points in the hyperbola is the actual source (confusion). But this is too simplistic, the auditory system is much more sophisticated and the source can be localized by other means.

Sound Localization

It says THE CONE OF CONFUSION.

Can you hear it better at that volume?

It’s like a cone of shame but for when you have Aural sex and get hearing AIDS