An unbroken series is a sequence of events, objects, or numbers that remain uninterrupted. It can also refer to a STREAK of successes or wins in a particular activity. In this context, the term 'STREAK' is used to describe an unbroken series. Streaks are often seen in sports, where a team or individual may have a long run of victories or losses without interruption. They can also be seen in other areas, such as business, where a company may have a long period of growth or decline.