What was the name of the secret society of the mathematicians that studied geometric ratios such as the golden ratio?

The secret society of mathematicians known for studying geometric ratiOS, including the golden ratio, is often referred to as the "Pythagoreans." Founded by the ancient Greek philosopher Pythagoras, this group believed in the mystical significance of numbers and their relationships in the universe. They explored various mathematical concepts, including harmony, proportion, and the intrinsic relationships between geometry and music.