Look up hail in
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Hail may refer to:

• Hail, frozen precipitation
• Ha'il, a city in Saudi Arabia
• the Collatz conjecture, aka 'hailstone problem', a mathematical problem in number theory
• Hail Mary, a traditional Catholic and Eastern Orthodox prayer calling for the intercession of Mary, the mother of Jesus.
• Highways Agency Information Line in England
• Hydro Acoustic Information Link, manufactured by Nautronix

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