noun
- plural of sigma, the eighteenth letter of the Greek alphabet (Σ, σ)
- plural of sigma, symbols used in mathematics and statistics to represent summation or standard deviation
Usage: mathematics; statistics
Examples
- The professor wrote several sigmas on the blackboard during the Greek alphabet lesson.
- In statistics class, we learned to calculate multiple sigmas for different data sets.
- The equation contained three sigmas representing different summation operations.
- Ancient Greek inscriptions often show sigmas in various forms.
- The student confused the sigmas with other Greek letters on the test.
- Multiple sigmas appeared in the complex mathematical formula.