The term 'What was that?' can be represented by four different crossword solutions: AGAIN (5 letters), HUH (3 letters), HUNH (4 letters), and EH (2 letters). These solutions are all interjections used to express surprise, confusion, or disbelief. The most common of these is 'huh, ' which is often used as a response when someone has not heard or understood something. 'EH' is another common interjection, usually used to ask for confirmation or agreement. 'Hunh' and 'AGAIN' are less commonly used, but they still convey the same sentiment.