the.com/jack
the everyman name so common it became a tool, a card, and a verb for theft
car toolLifts tons of steel with a simple screw thread
card rankOnce called the knave, the lowly servant
flag originA jack is a small flag flown at a ship's bow
every-manJack Tar meant sailor; jack of all trades, master of none
hydraulicsPascal's principle lets one push move enormous loads