Instruments That Do Not Fit Into Any of The Above Five Categories
A number of instruments neither fit wholly into any one of the above 5 categories, nor can they be properly described as belonging to some combination of these categories. Within the Hornbostel Sachs system they therefore do not have a number (hence the label NaN = Not a Number).
Read more about this topic: List Of Musical Instruments By Hornbostel-Sachs Number
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