The term 'Spinning Nut' is a type of fastener used in engineering and construction. It is also known as a LUG nut, which is a three-letter word that can be used to solve a crossword puzzle. The spinning nut is a type of nut with a built-in washer that is tightened onto a bolt or screw. It is designed to provide a secure connection between two components and prevent them from loosening due to vibration or other forces.