About Zen ranks and hierarchy

Zen is a school of Mahayana Buddhism that originated in China during the Tang dynasty, known as the Chan School, and later developed into various sub-schools and branches. From China, Chán spread south to Vietnam and became Vietnamese Thiền, northeast to Korea to become Seon Buddhism, and east to Japan, becoming Japanese Zen. Zen teachers often promote diaphragmatic breathing, stating that the breath must come from the lower abdomen (known as hara or tanden in .