The Japanese noun '遺跡 (いせき)' refers to 'ruins' or 'archaeological remains'. It is commonly used to describe historical sites, ancient structures, or remnants of past civilizations. This word is often associated with places of historical or cultural significance, such as temples, tombs, or settlements. For example: We visited ancient ruins「私たちは古代の遺跡を訪れました」(わたしたちはこだいのいせきをおとずれました). The ruins of the castle are well-preserved「その城の遺跡はよく保存されています」(そのしろのいせきはよくほぞんされています). The term can also be used in academic or archaeological contexts to describe artifacts or sites under study.