The LCM (Lowest Common Multiple) in NumPy refers to the capability of the NumPy library, a fundamental package for scientific computing in Python, to efficiently calculate the lowest common multiple of two or more integers or arrays of integers. The LCM is the smallest multiple that is divisible by all the given numbers. NumPy provides optimized functions to compute the LCM, making it convenient for various numerical and mathematical operations, particularly in fields like number theory, algebra, and data analysis.