From Xojo Documentation
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A constant is a fixed value.
Constants can have a type of Number (see below), String, Boolean, Color or Text.
There are three main type of constants:
- Local constants that you define in your code using Const. When defining a constant this way the data types is inferred if it is omitted.
- Project Item constants that you define on the project item using the Constant Editor.
- Localized Strings that you define on the project item using the Constant Editor.
This is how you can declare constants in code using the Const command: