The term 'SUMMATION SIGNS' refers to the Greek letter Sigma (Σ), which is used in mathematics and science to denote a summation or addition. It is often used in equations to represent the sum of all values in a given set. Sigma is also used to denote the standard deviation of a population, which is a measure of the spread of values in a data set. Sigma is one of the most commonly used symbols in mathematics and science, and its use is widespread across many disciplines.