大盘 (dàpán) is a compound noun with two main senses. In finance, it refers to the overall stock market or a broad market index (e.g., the Shanghai Composite Index). You'll hear it in phrases like 大盘走势 ('market trend') or 大盘股 ('large-cap stocks'). In food service, 大盘 means a large plate or a dish served on a large plate, as in the famous dish 大盘鸡 ('big plate chicken'). The financial sense is much more common in formal contexts.