一代三段 yīdàisānduàn

yīdàisānduàn phrase the three periods of the Buddha's teaching during his lifetime
Domain: Buddhism 佛教
Notes: Namely, the 華嚴 Avataṃsaka, 阿含 Āgama, and 方等 vaipulya; a division of the Tiantai school (FGDB '四種三段'; SH '一代三段', p. 1)