Structural superlubricity promises a world where friction - the force that wastes energy and causes wear in practically everything, from engines to wind turbines and from joints to pipelines, can nearly vanish. This perspective cuts through decades of confusion to show how commonly used criteria are subjective and sometimes even arbitrary, and under which conditions structural superlubricity can actually be uniquely defined as a critical phenomenon, thus justifying the use of the term ‘super’. By establishing a unified language for tribologists and a clear set of criteria for structural superlubricity whenever possible, this article aims to boost the efforts of the community towards designing durable and ultra efficient machines that will transform modern technology.