Homonym: σ (Summation)
The symbol "σ" (sigma) is a letter from the Greek alphabet, commonly used in mathematics and statistics. In statistics, it represents the standard deviation, which measures the amount of variation or dispersion in a set of values. A low standard deviation indicates that the values tend to be close to the mean, while a high standard deviation indicates more spread out values.
In addition to its statistical use, "σ" is also used in various scientific fields, such as physics and engineering. For example, it can represent stress in materials, denoting the internal forces acting within a structure. This versatility makes "σ" an important symbol in both theoretical and applied sciences.