The term 'Penny Attachment' refers to a device that was invented in the late 19th century by James Henry Atkinson. It was designed to help people save money by attaching a penny to a piece of paper or card, which would then be placed in a bank or post office savings account. The device was also known as a 'penny saver, ' which is the answer to the crossword puzzle. This device allowed people to save small amounts of money without having to worry about losing it or having it stolen.