The word "完璧" is formed by combining the character "完", meaning "complete" or "intact", with "璧", which refers to a type of ancient Chinese jade disc. It derives directly from the historical idiom "完璧归赵", recounting an incident where a precious jade was returned undamaged to the state of Zhao. Thus, the compound literally signifies "intact jade" and conveys the idea of something being preserved or restored in its original, perfect condition.