"Xiào liǎn" literally combines "xiào" (to smile) and "liǎn" (face), forming a compound noun meaning "smiling face." It refers to a facial expression showing happiness, friendliness, or amusement — either on a person’s actual face or as a stylized representation, such as in drawings, emojis, or decorations. Unlike the verb "xiào," which describes the action of smiling, "xiào liǎn" names the resulting expression itself.

This word is commonly used in everyday speech and writing to describe people’s expressions, especially when emphasizing warmth or approachability. It appears frequently in contexts like describing children’s expressions, complimenting someone’s cheerful demeanor, or referring to visual symbols of positivity — for example, on greeting cards, apps, or classroom posters. While it carries a positive connotation, it’s neutral in register and appropriate for both spoken and written Chinese across ages and formality levels.