Short for 円頓宗 (Endonshū, “Japanese Tiantai”).

Japanese Tiantai

Asia

(historical) Xinzhou (a historical state in China; modern Chongqing) / (historical) Shinano (a province of Japan) / (by extension, poetic) Nagano (a prefecture of Japan)

heresy / heretical sect

(dated) Short for ブエノスアイレス州 (Buenosu Airesu-shū, “Buenos Aires (a province of Argentina)”).

(dated) BC, British Columbia (a state of Canada)

southern Kyūshū (a region of Japan) / Minami Kyūshū (a city in Kagoshima Prefecture, Japan)

(historical) Kōzuke (a province of Japan) / (by extension, poetic) Gunma (a prefecture of Japan)

(Buddhism) Rinzai school, one of the major sects of Zen Buddhism