Demon duck of doom

Demon duck of doom refers to the small class of Turing machines up to 12 rules, i.e. machines with 6 states and 2 symbols, 4 states and 3 symbols, 3 states and 4 symbols or 2 states and 6 symbols.James Harland (2016) Busy beaver machines and the observant otter heuristic (or how to tame dreadful dragons) Theoretical Computer Science 646, 20: 61-85. (Preprint at arxiv) The name was given by James HarlandJames Harland at RMIT University, Australia as part of his Zany Zoo project.James Harland. The Busy Beaver, the Placid Platypus and other Crazy Creatures
It is known that 6 states and 2 symbols busy beaver is equal to at least \(10\uparrow\uparrow15\).
James Harland writes "The Demon Duck of Doom, or Thunderbird, stood over 2.5 metres tall and lived some 15 million years ago", and therefore it means .
== Sources ==
Category:Zany Zoo
Category:Classes