The Chinese word 王牌 (wángpái) is a compound noun formed by combining the character 王 (wáng), meaning "king" or "monarch", with 牌 (pái), meaning "card" or "playing card". Literally, it translates to "king card", directly borrowing from the concept of the highest-ranking card in many Western card games, such as the king in a standard deck or the trump card in games like bridge. Figuratively, this construction extends the meaning to signify an unbeatable advantage, a decisive resource, or the most outstanding person in a field, thus functioning as a metaphor for an "ace" or "trump card" in both competitive and general contexts.