domain
A domain describes the properties of table fields. The main property of a field is the data type, e.g. string, long, double, date, UTC. Other properties are, for example, the length of a string, the alignment of a string, and the date and time format.
In the Chart Manager, a range with an initial value, an end value, and a step size. Domains indicate the valid values for an attribute and are used to define the scale division of the axes or to verify data.
domains