reference variable
A reference variable is a variable, which shares its value with other (reference) variables. A reference variable does not have its own data area, i.e. when a reference variable is destructed the variable value still exists.
// OSI</p>
string a;
string &b &= a;
string &c &= b;
// a,b and c do have the same value. Changes in a become visible in b and c
Generalisations: variable