The onugadu is a Maldivian musical instrument made of a piece of

bamboo Bamboos are a diverse group of evergreen perennial flowering plants making up the subfamily Bambusoideae of the grass family Poaceae. Giant bamboos are the largest members of the grass family. The origin of the word "bamboo" is uncertain, ...

that is scored horizontally and rasped with a stick. One source describes it as having "an eerie,

gamelan Gamelan () ( jv, ꦒꦩꦼꦭꦤ꧀, su, ᮌᮙᮨᮜᮔ᮪, ban, ᬕᬫᭂᬮᬦ᭄) is the traditional ensemble music of the Javanese, Sundanese, and Balinese peoples of Indonesia, made up predominantly of percussive instruments. T ...

-like sound."Kirsten Ellis, Dominic (PHT) Sansoni. ''The Maldives''. Passport Books, 1992. ,
Pg 57
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References

Idiophones Maldivian musical instruments Bamboo musical instruments {{maldives-stub