There is substantial local variation in how Shinto is practiced; the anthropologist John K. Nelson noted it was "not a unified, monolithic entity that has a single center and system all its own". Different types of Shinto have been identified. "Shrine Shinto" refers to the practices centred around shrines, and "Domestic Shinto" to the ways in which "kami" are venerated in the home. Some scholars have used the term "Folk Shinto" to designate localised Shinto practices, or practices outside of an institutionalised setting. In various eras of the past, there was also a "State Shinto", in which Shinto beliefs and practices were closely interlinked with the Japanese state. In representing "a portmanteau term" for many varied traditions across Japan, the term "Shinto" is similar to the term "Hinduism", used to describe varied traditions across South Asia.