Who came up with the idea of m and MS?

The concept of "m" and "MS" in mathematics often refers to the use of variables and the concept of mathematical symbols in general. The letter "m" is commonly used to represent a slope in algebra, while "MS" can refer to various terms in mathematics or statistics, such as "mean square." These symbols and their meanings have evolved over time through the contributions of numerous mathematicians. However, no single individual is credited with their original introduction, as they are part of the broader development of mathematical notation.