Once created, the fields in the Tuple cannot be mutated. This makes the Tuple similar to a value type. A 2-tuple is called a pair. A 3-tuple is called a triple. A 4-tuple is called a quadruple. A 5-tuple is called a quintuple. A 6-tuple is called a sextuple. A 7-tuple is called a septuple. Larger tuples are called n-tuples.