Malcolm hood

The Malcolm Hood is a type of aircraft canopy. Originally developed for the Supermarine Spitfire, its concept proved valuable for other aircraft such as the North American Aviation-produced P-51B & C Mustangs as retrofit items, and standard on later versions of the Vought F4U Corsair, and somewhat emulated on the later models of the Luftwaffe's Focke-Wulf Fw 190 fighter.

The canopy was manufactured by the British company R Malcolm & Co which gave its name. Instead of taking a straight line between the canopy frames, the hood was bulged outward. This gave the pilot a better view to the rear.

...the Corsair's initial deficiencies were being worked out on a concurrent basis... The 689th production F4U-1 featured a number of significant changes. The most noticeable was that the cockpit was raised 18 centimeters (7.1 inches) to improve the pilot's forward view, and a bulged canopy, along the lines of the "Malcolm Hood" used on Spitfires, replaced the original "birdcage" framed canopy to provide better all-round field of view.

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Wikipedia