In machine tools, a spindle is a rotating axis of the machine, which often has a shaft at its heart. The shaft itself is called a spindle, but also, in shop-floor practice, the word often is used metonymically to refer to the entire rotary unit, including not only the shaft itself, but its bearings and anything attached to it (chuck, etc.).
So, yeah … what does that mean to me? Nothing. Except the rotating axis of the machine … that’s the people and that’s the political establishment. Always working to give us the shaft.
My comments should come as no surprise, I’ve been discussing this shit for 10 years.