Besides those singing bowl things.
I would say harp or vibraphone
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Theremin.
Do you consider answering “synthesizer” cheating?
Do you a more particular sample of something that comes to mind for you?
theramin (she’s also using a sampling device to copy her own voice)
Anything with feedback
https://www.youtube.com/watch?v=5_GZQIkmXEA&t=0
There are some other instruments in that video besides the singing bowls. I’ve seen some interesting large triangle things at a soundbath before as well.
Glass harp
Sitar or gong