The Table of Diversity Element, H.S. Diploma (Hs), is in the Education column on the Table of Diversity.

"A high school diploma is the traditional diploma that you receive when you complete all the requirements of a high school program. While the individual requirements often vary by state, students will need to earn credits through taking courses in general subjects such as English, science and math. Students are expected to attend school full time for four years to pass their classes and receive their diplomas."

Indeed: https://www.indeed.com/career-advice/career-development/ged-vs-high-school-diploma