Slendro (Javanese: ꦱ꧀ꦭꦺꦤ꧀ꦢꦿꦺꦴ, Balinese: ᬲ᭄ᬮᬾᬦ᭄ᬤ᭄ᬭᭀ, romanized: Sléndro) (Sundanese: ᮞᮜᮦᮔ᮪ᮓᮢᮧ, romanized: Saléndro) is one of the essential tuning systems used in gamelan instruments that has pentatonic scale. Based on Javanese mythology, the Slendro Gamelan tuning system is older than the pélog tuning system.