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Accepted answer

This is a dataLabel.

Data labels for the gauge. For gauges, the data labels are enabled by default and shown in a bordered box below the point.

You can change it in the plotOptions config or the series config as I've done in this example.

    series: [{
        name: 'Speed',
        data: [80],
        tooltip: {
            valueSuffix: ' km/h'
        },
        dataLabels:{enabled:false} // <-- turn that off
    }]

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