会三归一 (會三歸一) huì sān guī yī

huì sān guī yī set phrase to unite the three [vehicles] as one
Domain: Buddhism 佛教 , Subdomain: China
Notes: A Tiantai interpretation of the Lotus Sutra, as in 天台四教儀 “A Guide to the Tiantai Fourfold Teachings,” by 諦觀 Chegwan in the Tang (FGDB '會三歸一'; Ichishima and Chappell 2013, p. 167; SH '會三歸一', p. 402; T 1931)