The term 'ON ATTENTION' can be represented by four different crossword solutions: PSST (4 letters), AHEM (4 letters), HEY (3 letters), and LISTEN (6 letters). PSST is an interjection used to get someone's attention without alerting others, while AHEM is a sound made to get someone's attention in a more direct manner. HEY is an informal way of getting someone's attention, and LISTEN is a command used to tell someone to pay attention. All four of these words are used to indicate that someone should focus their attention on something.