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Despite the widespread use of the term \u201chyperbolic polariton,\u201d the hyperbolic nature has predominantly been inferred from numerical solutions of implicit eigenmode equations, rather than established through an explicit analytical isofrequency relation. In this work, we propose an analytical form for describing the iso\u2010frequency contour of the hyperbolic polaritons, showcasing their strictly hyperbolic nature. Such an analytical form is obtained based on the focusing behavior of the hyperbolic polariton and verified by both numerical simulations on commonly used hyperbolic media systems of the hyperbolic polaritons and experimental characterizations on a hyperbolic metamaterial film. The results present a concise and intuitive physical image of its propagation behavior with the angular dispersion, revealing the fundamental mechanism governing the realization of the deeply sub\u2010diffractional volume\u2010confined polariton and provide a groundbreaking methodology in developing novel hyperbolic polaritons\u2010based optical devices.<\/jats:p>","DOI":"10.1002\/adma.202521639","type":"journal-article","created":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T17:10:37Z","timestamp":1773940237000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["The Hyperbolic Nature of Hyperbolic Polaritons"],"prefix":"10.1002","volume":"38","author":[{"given":"Xiaoyu","family":"Xiong","sequence":"first","affiliation":[{"name":"State Key Laboratory of New Ceramic Materials School of Materials Science and Engineering Tsinghua University Beijing 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