503 (disambiguation)

503 may refer to:

In general

• 503 (number), a number in the 500s range
• AD 503 (DIII), a year in the Common Era
• 503 BC, a year Before the Common Era

Places

• Area code 503, a North American telephone area code in northwestern Oregon
• Country code +503, for El Salvador
• 503 Evelyn, asteroid #503, the asteroid Evelyn, the 503rd asteroid registered, a Main-Belt asteroid
• Highway 503, a list of roads named "503"
• Blaine School District No. 503, Whatcom County, State of Washington, USA

Military units

• No. 503 Squadron RAF, an Interwar British Royal Air Force bomber unit
• 503 Field Battery, Royal Artillery, British Army

Warships

• I-503, a Japanese WW2 submarine
• German submarine U-503, a German WW2 submarine
• USS LST-503, a U.S. WW2 tank landing ship

• TCG Beykoz (F-503), a Turkish navy frigate
• USS Frances II (SP-503), a U.S. Navy patrolboat
• TCG Hamit Hacı (M-503), a Turkish navy corvette
• JS Hakuryū (SS-503), a Japanese Maritime Self Defence Force submarine
• INS Hanit (503), an Israeli navy corvette
• BRP Lanao del Sur (LT-503), a Philippine navy tank landing ship
• USS Nueces (IX-503), a U.S. Navy ship
• USS Stevenson (DD-503), a WW2 U.S. Navy destroyer
• RVNS Vung Tau (HQ-503), a South Vietnamese green-water navy ship

Transportation

• 503 Kingston Rd (street car line #503), Toronto, Ontario, Canada; a tram line service

Vehicular

• Allison 503, a turboprop aeroengine
• Rotax 503, an aeroengine

• Avro 503, a British military seaplane
• Potez 503, a French military airplane
• Latécoère 503, a French flying boat
• LEAF Antares 503, a Ukrainian ultralight

• BMW 503, a grand tourer
• Fiat 503, a small family car

• British Rail Class 503, passenger train class

Other uses

• 503, a music track by Hans Zimmer on the Angels & Demons soundtrack
• 503 Service Unavailable, a computer networking HTTP status code
• Elliott 503, a computer
• FN 503, a semi-automatic pistol manufactured by FN Herstal
• A type of jeans, commonly in Levi's and Edwin
• A type of steel used for making bicycle frames

See also

• All pages with titles beginning with 503
• All pages with titles containing 503
• Flight 503
• 503rd (disambiguation)
• DIII (disambiguation) (503 in Roman numerals)