Koan

A paradoxical question, statement, or story used in Zen Buddhist practice to unsettle habitual reasoning and cultivate insight.

Hua Tou: A short phrase or question extracted from a koan for concentrated meditation. Some Rinzai practitioners focus on a koan’s central phrase rather than its full story.
Zen: A school of Mahayana Buddhism centered on meditation and direct insight. Koan practice developed within Zen traditions rather than as a free-standing puzzle technique.
Tang dynasty: A Chinese imperial dynasty that ruled from 618 to 907. Many encounters later treated as koans are set in the Tang-era Chan world.
Riddle: A question or statement whose solution depends on interpreting clues or wordplay. A koan may sound like a riddle, but its practice is not simply finding a clever answer.
Dokusan: A private meeting between a Zen student and teacher, often used to discuss practice. Students may present their understanding of an assigned koan in these teacher meetings.
Chan Buddhism: The Chinese Buddhist tradition from which Japanese Zen developed. Many classic koan stories originated in Chinese Chan communities.
Song dynasty: A Chinese dynasty that ruled from 960 to 1279. Song-era Chan writers compiled and commented on earlier encounter stories.
Paradox: A statement or situation that appears self-contradictory yet may disclose a truth. Paradox describes a common feature of koans, but not their full religious and pedagogical role.
Rinzai school: A Japanese Zen Buddhist school known for intensive koan training. Its curriculum uses koans as a central method of practice and evaluation.
Zazen: Seated meditation practiced in Zen Buddhism. Koan inquiry may accompany or structure meditation, depending on the tradition.

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