Wiktionary
n. One of the two essential scales of gamelan music native to Bali and Java in Indonesia. It has seven notes, of which sometimes only five are used.
Wikipedia
Pelog is one of the two essential scales of gamelan music native to Bali and Java, in Indonesia. In Javanese the term is said to be a variant of the word pelag meaning "fine" or "beautiful". The other, older, scale commonly used is called slendro. Pelog has seven notes, but many gamelan ensembles only have keys for five of the pitches. Even in ensembles that have all seven notes, many pieces only use a subset of five notes.
Usage examples of "pelog".
Somewhere a Tune In the musical Mode styl'd, by the East Indians, Pelog, which they term appropriate to evening, bells quietly with him as he goes, keeping the rhythm of his stride, and he begins to whistle briskly along.