The term 'typewriter bar' refers to a component of a typewriter that is used to separate words and characters. It is also known as a spacer bar, which is the six-letter solution to the crossword puzzle. The typewriter bar is a thin metal strip that is placed between two keys on the typewriter. It helps to ensure that the keys do not overlap when typing. The typewriter bar also helps to keep the keys in alignment, which makes typing easier and more accurate.