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QR Quick Release
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Also, known as a skewer. A QR is a common bicycle component that secures the wheel to the frame and fork and also tightens the seatpost clamp on some bikes. The typical type has a cam lever that is used to tighten and secure the wheel in place. These are front/rear specific and can be specific to the hub itself. These are a fast and effective way to install and secure a wheel.
The original idea for the Quick Release came during a cold and snowy bicycle race in 1927. Italian racer Tullio Campagnolo was changing a tire and his hands got too cold to turn the wing nuts on his wheel, which lost him the race. In 1930 he invented the Quick Release lever.