# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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# lang.accessibility.thousandsSep

Thousands separator to use when formatting numbers for screen readers. Note that many screen readers will not handle space as a thousands separator, and will consider "11 700" as two numbers.

Set to `null` to use the separator defined in lang.thousandsSep.