A5
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A5 or A-5 can refer to:
- Two A5 roads in the United Kingdom.
- The A5 expressway in Switzerland.
- The A5/1 and A5/2 ciphers used in cellular phones.
- A5, an aid climbing grade.
- A5, an aid climbing gear manufacturer (founded by John Middendorf), which was absorbed by The North Face in 1997.
- A5, a German rocket design in World War II.
- A5, an international standard paper size (148×210 mm) defined by ISO 216.
- HMS A5, an A-class submarine of the Royal Navy.
- USS A-5, a Plunger-class submarine of the United States Navy.
- The A-5, better known as the Nanchang Q-5, a Chinese-built jet fighter bomber.
- The A-5 Vigilante, a carrier-based supersonic bomber designed for the US Navy.