What is "kikokushijo"

and are Japanese-language terms referring to the children of Japanese expatriates who take part of their education outside Japan. The former term is used to refer to children who have returned to Japan, while the latter refers to such children while they are still overseas. They are referred to in English variously as "sojourn children" or "returnees". The term " third culture kids" has also been used, but not without reservations.