Biāo zhì literally combines biāo (‘mark’, ‘indicate’) and zhì (‘flag’, ‘banner’), evoking the image of a visible, distinguishing sign—like a flag planted to signal identity or purpose. Historically, it often referred to official emblems, military banners, or symbolic markers denoting authority, affiliation, or natural characteristics. Though still understood, it carries a slightly formal or literary tone and appears more frequently in written contexts than in everyday speech.

Today, biāo zhì is used for enduring, meaningful symbols—especially those representing groups, ideologies, species traits, or conservation status. For example, a distinctive physical feature that identifies an animal species (e.g., the giant panda’s black eye patches) may be called its biāo zhì. It conveys weight and recognizability, unlike the more neutral and versatile biāo jì (‘mark’ or ‘sign’).