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A union is a data structure used in certain programming languages, most notably C and C++. It is a user-defined data type that can store different data types in the same memory location. A union can represent any of its member data types at a particular time, and it allocates memory equal to the size required for the largest data type in line-size. To define a union, use the keyword "union" followed by the union name and its members enclosed in curly braces.

Here is the syntax for creating a union in C/C++: ```c union UnionName { dataType1 member1; dataType2 member2; ... }; ``` An example of a union with two members - an integer (int) and a float - is: ```c union Data { int i; float f; }; ```

In programming languages that support unions, like C and C++, you can create arrays of union data structures. In this step, we will demonstrate how to define an array of unions in C/C++. To create an array of unions, you need to define the union type and then declare an array of that type. Here's an example of creating an array of 5 elements of the previously defined "Data" union: ```c union Data arrayOfUnions[5]; ``` You can access and manipulate the individual elements of an array of unions using their indices (starting from 0), just like a regular array. To access the integer and float members of the first element in "arrayOfUnions", you would use the following syntax: ```c arrayOfUnions[0].i // access the integer member arrayOfUnions[0].f // access the float member ``` An example of initializing an array of unions with 5 elements is: ```c union Data arrayOfUnions[5] = { {1}, // integer 1 {3.5}, // float 3.5 {2}, // integer 2 {4.2}, // float 4.2 {5} // integer 5 }; ``` In conclusion, the statement "You may define arrays of unions" is True for programming languages that support unions, such as C and C++.