From Xojo Documentation
Returns the character in the given encoding specified by the Unicode CodePoint.
You can activate the Character viewer window by selecting Emoji & Symbols" from the Edit menu of most apps. This allows you to search for characters and get code point information. For example, search for "neptune" to find a neptune character and then right-click to copy the Character Info show here:
♆ NEPTUNE Unicode: U+2646, UTF-8: E2 99 86
You can use the above number as the hexadecimal code point like this:
s = Encodings.UTF8.Chr(&h2646) // Converts the Unicode character NEPTUNE into its UTF8 counterpart
For more information about Unicode and the code points, see this article on Wikipedia.