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Showing content from https://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/specialTypes.html below:

Special Types - Adobe ActionScript® 3 (AS3) API Reference

The three special types are the untyped specifier (*), void, and Null.

Type Description * Specifies that a property is untyped. void Specifies that a function cannot return any value. Null A special data type that represents the lack of a value. Usage
propertyName:*
Language Version: ActionScript 3.0 Runtime Versions: Flash Player 9

Specifies that a property is untyped. Use of the asterisk symbol for a type annotation is equivalent to using no type annotation. Expressions that read from untyped properties are considered untyped expressions. Use of untyped expressions or properties is recommended in the following circumstances:

When you want to defer type checking to runtime. You can use an untyped property or expression to circumvent compile-time type checking in strict mode. Note, however, that runtime type checking of assignment statements occurs whether you use strict mode or not.
When you want to store the value undefined in a property. Unlike previous versions of ActionScript, the value undefined is not a member of the Object data type. You must use an untyped property to store the value undefined.

Related API Elements

Usage
functionName():void {}
Language Version: ActionScript 3.0 Runtime Versions: Flash Player 9

Specifies that a function cannot return any value. The void type is a special type that contains exactly one value: undefined. It is special in that its use is limited to the return type of a function. You cannot use void as a type annotation for a property.

Related API Elements

Language Version: ActionScript 3.0 Runtime Versions: Flash Player 9

A special data type that represents the lack of a value. The Null data type includes only one value: null. The Null data type is special in that it is not associated with a class. This means that you cannot use the Null data type as a type annotation for a property.

Related API Elements

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