I work in retail, and when people enter their debit card, I tell them to enter their PIN. They look at me with a blank stare until I'll ask them to enter their PIN “number”. Yes, people. Please enter your Personal Identification Number Number. Thank you.
Froggy
In speech the n-sound is space-wise continuous so give the benefit of the doubt and assume the person has said PINumber.
pleonasm: 1. the use of more words than are necessary to express an idea; redundancy. 2. an instance of this, as free gift or true fact. 3. a redundant word or expression.