What does industrial triangle mean?

The term "industrial triangle" typically refers to a specific geographic area where industrial activities are concentrated, often characterized by a high density of factories, manufacturing plants, and related businesses. A well-known example is the industrial triangle in the northeastern United States, which includes cities like Boston, New York, and Philadelphia, known for their historical significance in manufacturing and commerce. This concept can also apply to other regions globally, highlighting areas where economic activities are concentrated and interlinked.