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The right hand is the master key that locks every rotation in space to one consistent direction. Place your right thumb along any axis. The curl of your fingers now traces the only positive spin that axis will ever know. Blue marks +x, red +y, green +z. Each matching ring shows exactly that curl. This single convention forces x × y to land on z. Flight computers, robot arms, and spacecraft all inherit the identical signs so a positive pitch never flips the vehicle upside down. One hand, three axes, and the geometry of turning becomes unambiguous.