The term 'Number on a Spreadsheet' can be summarized as a DATUM, which is a five-letter word. A DATUM is a single piece of information, such as a number, that is stored in a spreadsheet. Spreadsheets are used to organize and store data, and they are commonly used for accounting, budgeting, and other financial tasks. A number on a spreadsheet can represent a variety of things, such as a quantity, a price, or a date.