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01

See also: O1

01 may refer to:

• Zero One also known as Machine City, a city-state from the Matrix saga
• Kolmogorov's zero-one law, a law of probability theory
• Pro Wrestling ZERO1-MAX, a wrestling promotion formerly known as Pro Wrestling ZERO-ONE
• BAR 01, a Formula One chassis
• 2001 and every other year ending with 01
• 01, the former dialling code for Greater London