A kentongan, or kentungan, is a 13th-century traditional Indonesian-Javanese type of slit drum that is classified as a percussion instrument and an idiophone. A hollow wooden bell, the kentongan is used primarily as a tool for communication, community security, and religious signaling. In terms of communication, it is often used for disaster risk and warning of an incoming disaster. The instrument is commonly associated with the AI-generated meme Tung Tung Tung Sahur.