noun
Historical term referring to the ancient Chinese writing system carved on turtle shells and animal bones, used primarily during the Shang dynasty for divination.
甲骨文は、殷の時代に使われた最古の漢字の一つです。
Oracle bone script is one of the oldest forms of Chinese characters, used during the Yin dynasty.
From 甲骨 (こうこつ, 'turtle shell and animal bone') + 文 (ぶん, 'writing, script'). The term directly describes the medium and nature of the script.