The term refers more to the set of instruments than to the players of those instruments. A Gamelan is a set of instruments as a distinct entity, built and tuned to stay together – instruments from different gamelan are generally not interchangeable.
The word Gamelan comes from the Javanese word gamels, meaning "to strike or hammer", and the suffix an, which makes the root a collective noun.
This instrument usually played during a traditional or religious event.
Below pictures of Gamelan taken at Jogja.



More detail at here.
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