Umbul-umbul, also called rérontek or, archaically, tunggul, are a type of flag or pennant made of a strip of cloth whose longer side is attached to a pole. They are used in the traditional culture of Java and Bali, Indonesia, where they are carried in festivals and serve other decorative purposes.
A Sundanese language dictionary of 1862 translates the word "umbul-umbul" as "a banner; any signal, as a flag or other object, hoisted so as to be seen at a distance. Banners carried about the person of native chiefs. A small flag attached to a spear." It also notes that the same word, pronounced differently, means "to come in sight, to show up".
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- Robson, Stuart O.; Wibisono, Singgih; Kurniasih, Yacinta (2002). Javanese-English Dictionary. Tuttle Publishing. p. 779. ISBN 0-7946-0000-X.
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- Rigg, Jonathan (1862). A Dictionary of the Sunda Language of Java. Lange.