Possible Duplicate:
What does the caret (‘^’) mean in C++/CLI?
In C++/CLR, what does a hat character ^ do?
What does the ^ character mean in C++ when applied to the data type in a variable declaration, as in:
String^ input;
or
List<String^>^ phoneNumbers;
Assuming a Microsoft-compiler, this is not from C++ but from Microsoft own C++ dialects called C++/CLI. It denotes a .NET-garbage collected object.