Special square and cube characters for units

In the CorelDRAW VBA help file under Units of Measurement...Supported Query Methods, there is a line that shows how to put square and cube into a unit but I don't quite get what (U+00B2) means. Here is the quote from the file:

Powers of 2 and 3 can be specified by using special characters ² (U+00B2) and ³ (U+00B3) after the unit of measurement, as in the following examples:

{2 mm²} yields 2 sq. mm
{3 in³} yields 3 cubic inches

How do I enter those characters?

Thayne