In a large written number, what is the name given to each group of three place values, such as ones, thousands, and millions?

1. Large numbers are organized into groups of three place values each. 2. Commas are used in writing to separate these groups. 3. Each group of three place values is called a period. 4. A digit is a single numeral, and remainder and quotient belong to division, so none of those name the group. _Source: OpenStax Prealgebra (CC BY 4.0), Ch 1 "Whole Numbers", section 1.1 Introduction to Whole Numbers_