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Orbiting Wide-angle Light Collectors (OWL) is a conceptual space mission that would place two spacecraft in Earth orbit with Schmidt cameras to catch short visible light flashes in Earth atmosphere that constitute Cherenkov radiation due to UHE cosmic rays. It would use two such spacecraft for stereo observation, to assist in determining the direction of the incoming particle.
A similar plan is POEMMA, apparently a later name adopted as the project progressed.
Note that the abbreviation OWL was also used for the Overwhelmingly Large Telescope concept.