rōshi

Rōshi (老師) (Japanese: "old teacher"; "old master") is a title in Zen Buddhism with different usages depending on sect and country. In Rinzai Zen, the term is reserved only for individuals who have received inka shōmei, meaning they have completed the entire kōan curriculum; this amounts to a total of fewer than 100 people at any given time. In Sōtō Zen and Sanbo Kyodan it is used more loosely. This is especially the case in the United States and Europe, where almost any teacher who has received dharma transmission might be called rōshi, or even use it to refer to themselves, a practice unheard of in Japan.