德山 most often refers to the Tang-dynasty Chan (Zen) master
德山宣鉴 Déshān Xuānjiàn (782-865), known for the teaching style
棒喝 bànghè ('the stick and the shout') — striking students with a staff to break their conceptual habits. The phrase
德山棒，
临济喝 ('Deshan's stick, Linji's shout') captures the two most aggressive teaching lineages of Chinese Zen. Also used as a place name in Hunan and a Japanese surname (Tokuyama).
