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An answer is a set of measurements (Knight shift along a, b, c; directional thermal conductivity; polar Kerr; quasiparticle interference of surface states) consistent with one representation.","problem_ref":null,"references":"","settled_by":"Knight shift along all three axes in high-quality crystals plus a phase-sensitive surface probe that singles out one representation.","status_note":"Odd-parity pairing is supported by several probes; resonant ultrasound (2024) indicates a single-component order parameter, thermal conductivity (2026) reports point-like gap minima that do not reach zero, and polar Kerr evidence for time-reversal breaking was not reproduced in cleaner crystals (2023).","title":"Symmetry of the superconducting order parameter of 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