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A unique filament is identified in the {\it Herschel} maps of the Orion Agiant molecular cloud. The filament, which, we name the Stick, isruler-straight and at an early evolutionary stage. Transverse position-velocitydiagrams show two velocity components closing in on the Stick. The filamentshows consecutive rings/forks in C$^{18}$O(1-0) channel maps, which isreminiscent of structures generated by magnetic reconnection. We propose thatthe Stick formed via collision-induced magnetic reconnection (CMR). We use themagnetohydrodynamics (MHD) code Athena++ to simulate the collision between twodiffuse molecular clumps, each carrying an anti-parallel magnetic field. Theclump collision produces a narrow, straight, dense filament with a factor of$>$200 increase in density. The production of the dense gas is seven timesfaster than free-fall collapse. The dense filament shows ring/fork-likestructures in radiative transfer maps. Cores in the filament are confined bysurface magnetic pressure. CMR can be an important dense-gas-producingmechanism in the Galaxy and beyond.

The CARMA-NRO Orion Survey: Filament Formation via Collision-Induced Magnetic Reconnection -- The Stick in Orion A