From Xojo Documentation
The ways in which characters are represented for the purpose of counting when part of a selection or range.
|Native||The native mode for the platform. Codepoints is the native mode for macOS and Windows. Characters is the native mode for Linux.|
|Characters||Each logical character is counted as a single character regardless of how many bytes are actually required.|
|Codepoints||Each logical character is counted as the number of Unicode Codepoints (bytes) it requires. An emoji, for example, requires two bytes.|
Desktop projects on Linux, macOS and Windows operating systems.