The term ONE OF SEVEN DEADLY ITEMS can be summarized as a reference to the seven deadly sins, which are pride, greed, lust, envy, gluttony, wrath, and sloth. These sins have been referenced in various religious texts, such as the Bible, and are seen as vices that can lead to spiritual downfall. The crossword solution for this term is SIN, which is an appropriate three-letter abbreviation for the seven deadly sins.