The term 'THAT, IN SPANISH' can be translated into two different words in Spanish, depending on the context. The first word is 'ESO', which is a pronoun used to refer to something that has already been mentioned or is known by both the speaker and the listener. The second word is 'ESA', which is also a pronoun but is used to refer to something that has not been mentioned before. Both words are three letters long and are commonly used in Spanish conversations.