“12 Noon” is a good way of ensuring that things are less confusing — compared to “12 PM”, which some people are known to have expected to happen a second after “11.59 PM” and many have missed trains scheduled to depart at “12 PM”.
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.
