P31 may refer to:
Aircraft
*
Boulton Paul P.31 Bittern
The Boulton Paul Bittern was a 1920s British night-fighter aircraft built by Boulton Paul Limited of Norwich, named after the marsh bird of the same name.
Design and development
Designed to Air Ministry Specification 27/24, which called fo ...
, a British prototype fighter aircraft
*
Curtiss XP-31 Swift
The Curtiss XP-31 Swift (Wright Field Project Number XP-934) was a 1930s American experimental monoplane fighter built by Curtiss for the United States Army Air Corps.
The XP-31 featured the first enclosed cockpit on a U.S. pursuit aircraft ...
, an American experimental fighter aircraft
*
Percival P.31 Proctor, a British radio trainer and communications aircraft
Vessels
* , a corvette of the Argentine Navy
* , a submarine of the Royal Navy
* , a corvette of the Indian Navy
* , a ship of the Irish Naval Service
* , of the Armed Forces of Malta
Other uses
*
Makhuwa language
Makhuwa (''Emakhuwa''; also spelled Makua and Macua) is the primary Bantu language of northern Mozambique. It is spoken by roughly 5.8 million Makua people, who live north of the Zambezi River, particularly in Nampula Province, which is virtuall ...
*
Papyrus 31
Papyrus 31 (in the Gregory-Aland numbering), designated by 𝔓31, is an early copy of the New Testament in Greek. It is a papyrus manuscript of the Epistle to the Romans, it contains only Romans 12:3-8. The manuscript paleographically has been ...
, a biblical manuscript
*
Phosphorus-31
Although phosphorus (15P) has 22 isotopes from 26P to 47P, only 31P is stable, thus phosphorus is considered a monoisotopic element. The longest-lived radioactive isotopes are 33P with a half-life of 25.34 days and 32P with a half-life of 14.268 d ...
(P-31 or
31P), a stable isotope of phosphorus
*
Pioneer P-31
Pioneer P-31 (also known as Atlas-Able 5B or Pioneer Z) was intended to be a lunar orbiter probe, but the mission failed shortly after launch. The objectives were to place a highly instrumented probe in lunar orbit, to investigate the environme ...
, a failed lunar probe
* P31, a
state regional road in Latvia
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