 Their explicit references are primarily to Mahāyāna Buddhism, especially to the East Asian Buddhist schools of Zen (predominantly the Rinzai tradition but also notably Dōgen of Sōtō) and Pure Land (predominantly Shinran’s Shin) Buddhism. The key Sanskrit term in Mahāyāna Buddhism here is śūnyatā (“emptiness”; kū in Japanese). With the noteworthy exception of the later Nishitani, however, the Kyoto School tends to favor the Chinese glyph mu (“nothingness”; wu in Chinese), which is found predominantly in Zen, and which reflects the early attempt to “match terms” with Daoism in the translation and interpretive development of Buddhism in China. Let us briefly examine both of these Asian sources for the Kyoto School’s philosophies of absolute nothingness, śūnyatā and  wu/mu.[7]