Matrix code refers to the digital rain of green characters seen in the Matrix film series. It symbolizes the underlying computer code that creates the simulated reality in which the characters exist. This code is often depicted as cascading symbols and numbers, representing the complex algorithms that govern the virtual world. In a broader context, matrix code can also refer to any type of data organized in a grid format, where information is arranged in rows and columns. This structure is commonly used in mathematics, computer science, and data analysis to represent and manipulate data efficiently.