22/7

22/7 may refer to:

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• Approximations of pi
• Proof that exceeds
• Pi Day, mathematical celebration on March 14

• July 22
• 2011 Norway attacks, referred to in Norway as 22 July or 22/7

• 22/7 (group), a Japanese idol group
• 22/7 (TV series), Japanese anime series based on the idol group