UNIQUE (Entity Differentiator)

UNIQUE (Entity Differentiator) is an attribute that appears ONLY with a given entity and distinguishes it from similar entities.

For example, 'stress hormone' is a UNIQUE attribute for cortisol, 'Wawel Castle view' for Hotel Pod Wawelem. UNIQUE attributes should appear at the very top of your content: in the H1 and lead, because they determine the algorithm's first impression. If unique characteristics are buried at the bottom of the text, the algorithm won't recognize what distinguishes the given entity.

It's like introducing yourself to a new person — first you say what distinguishes you ('I'm the only Polish climber who conquered K2 solo'), then the basics.

In practice, during competitive analysis (competitive gap analysis), look for UNIQUE attributes that only 1-2 out of 10 competitors have. That's your opportunity for Information Gain and citation in AI Search.