4N may refer to: 4th parallel north latitude Air North's IATA code 4N, the production code for the 1976 Doctor Who serial The Hand of Fear 4N, A special TSMC semiconductor node built specifically for Nvidia in their Geforce 40 Series of graphics cards See also Hückel's rule, 4n + 2 rule Singly even number, a number of the form 4n + 2 A-4N, a model of Douglas A-4 Skyhawk AD-4N, a model of Douglas A-1 Skyraider RQ-4N, a model of Northrop Grumman RQ-4 Global Hawk F-4N Phantom II, see List of McDonnell Douglas F-4 Phantom II variants F7F-4N, a model of Grumman F7F Tigercat F4N, a model of Vought F4U Corsair N4 (disambiguation)