I always thought it meant Cruiser-Type A. Guess I learnt something.
Anyways Lets just try and stick with typical armoured cruisers, eg Blucher, Scharnhorst (the one that was sunk at the Falklands, not the battleship/battlecruiser or ocean liner ones). Otherwise all the world's heavy cruisers: Mogami, Baltimore, Zara, County etc, would be classified s armoured cruisers.
And the latter mentioned cruiser is by no means in my books that well armoured