The universal probability is the algorithmic probability of a universal prefix-free Turing machine, used to define a universal prior distribution.

Universal probability may also refer to:

• Algorithmic probability, also known as universality probability, the probability that a universal Turing machine remains universal even when every input of it is prefixed by a random binary string.
• Universal probability bound, a notion used by proponents of the pseudoscientific theory of intelligent design.

See also

• Universality

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