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A string is a scripting data type consisting of a string of characters enclosed by double quotes on each end. Strings are typically used to represent a message, for example in the Display Message function, or when referencing an entity name or property name within a script. Placeholder expressions can be used within a string as a way to generate dynamic values at game runtime.
display_message("Hello world! This is a string.")
The above example shows a string passed to the Display Message function as an argument.
set_entity_property(entity["sign_01"], "message", "This is the sign's message text.")
The above example demonstrates 3 different usages.