The A-12 OXCART, a CIA reconnaissance aircraft that formed the basis of the SR-71 Blackbird
The A-12 Avenger II, a Cold War_era aircraft project that was cancelled prior to production.
The A12 rocket, designed during the Second World War.
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The A12 has been named as the designation for a true orbital launch vehicle, as sketched out at Peenemuende.
The reconstruction here is purely an estimate, assuming the A12 stage followed the design philosophy of the A11 drawing.
Unless development of a new engine was planned, no fewer than 50 A-10 engines would have been required in the first stage, presaging Von Braun's design of 1948/1952.