‘喇叭’ (lǎ ba) is a noun referring to a device that produces loud sound—most commonly a car horn, a musical trumpet, or an electronic loudspeaker. Though the two characters 喇 and 叭 individually have no independent meaning in this context, together they form an onomatopoeic compound imitating the sharp, brassy ‘la-ba’ sound of such instruments or alerts. This phonetic reduplication is typical in Chinese for naming sounds or sound-producing objects.

The word is used across everyday, technical, and informal contexts: drivers ‘blow the horn’ (按喇叭), musicians play the ‘trumpet’ (吹喇叭), and public announcements come through a ‘loudspeaker’ (用喇叭广播). It’s neutral in register but rarely used in formal writing when precision is needed—e.g., ‘car horn’ (汽车喇叭) or ‘public address system’ (扩音系统) may be preferred in technical documents.