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Zirconium monoxide (ZrO) absorption lines define rare S-type stars and arecurrently being sought on exoplanets. Successful detection is dependent on anaccurate and comprehensive line list, with existing data not ideal for manyapplications. Specifically, the Plez \etal{} line list is near-complete but hasinsufficient accuracy for high-resolution cross-correlation, while the Sorensen\& Bernath data has high accuracy but only considers a small number of spectralbands. This article presents a novel spectroscopic model, variational line listand trihybrid line list for the main \ZrO{} isotopologue, as well asisotopologue-extrapolated hybrid line lists for the \isoa{}, \isob{}, \isoc{},\isod{}~and \isoe{} isotopologues. These were constructed using \DUO{} based onicMRCI-SD/CASSCF~\abinitio{} electronic data calculated using \MOLPRO{},experimental energies obtained from a previous \Marvel{} data compilation andperturbative energies from Sorensen \& Bernath. The new \ZrO{} \EXOMOL{}-styletrihybrid line list, \LLname{}, comprises \noenergies{} energies(\noMaenergies{} experimental) and \notransitions{} transitions up to30,000~\cm{} (333~nm) between ten low-lying electronic states (\ZrOX{},\ZrOaa{}, \ZrOA{}, \ZrObb{}, \ZrOB{}, \ZrOC{}, \ZrOdd{}, \ZrOee{}, \ZrOff{} and\ZrOF{}). The inclusion of experimental energy levels in \LLname{} means ZrOwill be much easier to detect using high-resolution ground-based telescopes inthe 12,500 -- 17,500~\cm{} (571 -- 800~nm) spectral region. The inclusion ofvariational energy levels means that the ZorrO line list has very highcompleteness and can accurately model molecular absorption cross-sections evenat high temperatures. The \LLname{} data will hopefully facilitate the firstdetection of ZrO in the atmosphere of a hot Jupiter exoplanet, or alternativelymore conclusively exclude its presence.

Full Spectroscopic Model and Trihybrid Experimental-Perturbative-Variational Line List for ZrO