Difference between empty client type and other client type

We are using Query metric Aggregates endpoint by Client Type and we are wondering what is the difference between "" Client Type and "Other" Client Type.
Here is an example of a response we are having : 

{
    "data": [
        {
            "dimensions": [
                ""
            ],
            "measurements": {
                "count": [
                    11938.0
                ]
            }
        },
        {
            "dimensions": [
                "Other"
            ],
            "measurements": {
                "count": [
                    951.0
                ]
            }
        }
    ]
}

We are using version 2023-09-15

Thank you !