Final answer:
Round brackets indicate a function call in many programming languages, which is how an interpreter distinguishes between a function and a variable; this statement is true.
Step-by-step explanation:
The statement that round brackets, (), are used by the interpreter to distinguish between a function and a variable is True. In many programming languages, when the interpreter sees a name followed by parentheses, it interprets this as a function call. The parentheses may enclose arguments that are being passed to the function. On the other hand, when the interpreter encounters a name without parentheses, it typically treats it as a variable or another kind of identifier that is not a function.