The star/diamond shape is derived from the concept of a "neural network," which is a type of machine learning algorithm that's modeled after the structure of the human brain. In a neural network, data is fed into a series of interconnected nodes, or "neurons," that process and analyze the information.

When visualized, the connections between these nodes form a pattern that looks a lot like a star or diamond shape. Over time, this shape has become a popular symbol for AI because it represents the complex and interconnected nature of machine learning algorithms.