NAME AC is the most powerful armor in Wasteland.
The name is actually derived from the statistics bar, as the string used to display it is applied to the item. The rating is simply the maximum positive value for armor class.
It can only be acquired via the Super loot bag exploit in Acapulco Casino in Needles and thusly, only on the IBM/PC version of the game. It does not (sadly) appear in Wasteland Remastered, because the super loot bag window can't be scrolled.