The term 'INFORMATIONAL UNIT' can be summarized as a DATUM, which is a five-letter word meaning a single piece of information. It is often used in computing and data processing to refer to a unit of information that is stored, processed, or transmitted. It can also refer to a unit of knowledge or a unit of communication. In the context of computing, it is often used to refer to a single item of data, such as a character, a number, or a bit.