旗帜 literally means 'flag' or 'banner'—a piece of cloth mounted on a pole, often bearing symbols, colors, or slogans. The first character 旗 (qí) refers specifically to a flag used for identification or signaling, while 帜 (zhì) emphasizes the banner’s function as a visible emblem or standard. Together, 旗帜 retains this concrete meaning but is frequently used figuratively to represent a guiding principle, cause, ideology, or rallying point—especially in political, social, or philosophical contexts.

In everyday usage, 旗帜 appears in both literal and metaphorical settings: you might see it describing national flags at ceremonies, protest banners in public spaces, or abstract concepts like 'the banner of environmental protection' (环保的旗帜). It carries formal, sometimes solemn or weighty connotations and is rarely used in casual speech about simple decorative items. Its compound structure makes it more literary than the standalone 旗, and it's commonly paired with verbs like 树立 (to raise), 高举 (to hold high), or 捍卫 (to defend).