C1

C1, C01, C.I or C-1 may refer to:

Arts and media

• C1, a note-octave in music
• C1 Television, a Mongolian television channel
• Cinema One, Philippine pay TV channel
• Schecter C-1 Hellraiser FR, a guitar model
• A Yamaha grand piano model
• "C1", a slang expression in the video game Counter-Strike, used to express agreement

Biology and medicine

Anatomy

• Cervical vertebra 1, the first cervical vertebrae of the vertebral column
• Cervical spinal nerve 1, a spinal nerve of the cervical segment

Biochemistry

• C1 complex, the first component of the classical complement pathway
• C1 domain, an important secondary messenger protein domain
• C1-inhibitor, a human serine protease inhibitor
• C1 regulatory sequence for the insulin gene
• Apolipoprotein C1, a human lipoprotein
• Chlorophyll c1, a form of chlorophyll
• Cytochrome C1, a precursor protein to Cytochrome C
• Proanthocyanidin C1, a type of polyphenolic compound
• Prostaglandin C1, a form of prostaglandins

Other uses in biology and medicine

• C1 and P1 (neuroscience), a component of the visual evoked potential
• ATC code C01, a subgroup of the Anatomical Therapeutic Chemical Classification System
• "malignant neoplasm of base of tongue", a form of oral cancer (ICD-10 code "C01")
• A microfluidic single-cell analysis system sold by Fluidigm, short name C1

Chemistry

• C1 Chemistry, study of methane, methanol, carbon monoxide, carbon dioxide

Computing

Hardware

• C-One, a single-board microcomputer
• C1 Famicom TV, a family of Famicom television-set hybrids manufactured by Sharp Corporation in 1983
• ATI C1, codename of the Xbox 360 GPU Xenos
• Apple C1, a cellular modem chip
• A type of error on a compact disc (CD); see Compact disc § Integrity
• LG C1, a television set released in 2021

Other uses in computing

• C0 and C1 control codes defined in ISO 6429
• C1 (protocol), a 1984 protocol for file transfer, also known as "Punter"
• TCSEC C1 security class
• A CPU power state in the Advanced Configuration and Power Interface

Mathematics

• $C^{1}$, the set of all continuously differentiable functions
• C1 field, a quasi-algebraically closed field
• C1, the first of four pure modules taken in the Advanced Level (UK) Maths syllabus

Transportation

Air

• C-1 Trader, a cargo-version of the S-2 Tracker anti-submarine warfare aircraft of the US Navy
• AEG C.I, a German World War I reconnaissance aircraft
• AGO C.I, a 1915 German reconnaissance biplane
• Albatros C.I, a 1915 German two-seat general-purpose biplane
• Aviatik C.I, a 1915 German observation plane
• Cierva C.1, a 1920 Spanish experimental autogyro
• DFW C.I, a WWI German reconnaissance aircraft
• Douglas C-1, a cargo/transport airplane produced by Douglas Aircraft for the U.S. Army Air Service starting in 1925
• Fokker C.I, a 1918 German reconnaissance biplane
• Friedrichshafen C.I, a 1914 German single-engined amphibious reconnaissance biplane
• Hansa-Brandenburg C.I, a 1916 German 2-seater armed single-engine reconnaissance biplane
• Kawasaki C-1, an indigenous transport aircraft of the Japanese Air Self-Defense Forces
• Loring C-1, an interwar period Spanish fighter prototype
• Otto C.I, a 1915 German reconnaissance biplane
• Rumpler C.I, a 1915 German two-seater single-engine reconnaissance biplane
• Southern Cross Airport (New Jersey) (FAA LID: C01)

Land

Routes

• Circumferential Road 1 or C-1, an arterial road of Manila, Philippines
• London Buses route C1
• Route C1 (Shuto Expressway), the Inner Loop of Tokyo's Shuto Expressway system
• Claro M. Recto Avenue, a road in Metro Manila, Philippines
• Massachusetts State Route C1
• Câble 1, a cable car route in Grand Paris, France

Land vehicles

• BMW C1, a cabin scooter
• Chevrolet Corvette C1, first generation sold from 1953 to 1962, denoted a solid-axle rear-end
• Citroën C1, a small car
• Ford C1 platform, the Ford Motor Company's global compact car automobile platform
• Leapmotor C01, a battery electric executive sedan
• Lit C-1, a prototype cabin motorcycle
• Nimrod NRA/C1, a 1981 test design racing car
• Sauber C1, a Sauber sport car

Other uses in land transport

• C-1, the numberplate of the Prime Minister of Australia's official VIP transportation
• A type of heavy goods vehicle licence
• A one-way traffic sign in the Vienna Convention on Road Signs and Signals

Rail

• C1-class Melbourne tram
• Bavarian C I, an 1847 German steam locomotives class
• Ceylon Government Railway C1, a steam locomotive class
• GNR Class C1 (small boiler), a British 4-4-2 steam locomotive class (classified C2 during LNER ownership)
• GNR Class C1 (large boiler), a British 4-4-2 steam locomotive class
• LB&SCR C1 class, an 1882 British freight steam locomotive
• Long Island Rail Road C1, a bilevel railcar built by Tokyu Car Corporation
• NER Class C1, a British 0-6-0 steam locomotive class
• PRR C1, an American PRR steam locomotive
• Finnish Steam Locomotive Class C1

Sea

• C-1, later renamed Isaac Peral (C-1), a Spanish Navy submarine
• HMS C1, a C-class submarine of the Royal Navy
• USS C-1 (SS-9), a C-class submarine of the US Navy
• USS Newark (C-1), a protected cruiser of the US Navy
• Type C1 ship, a small cargo vessel built by the US in large numbers before and during World War II

Space

• Cluster 1, also known as Rumba, an ESA satellite

Sports

For racing cars, see § Land vehicles.

• C1, a solo canoe discipline including sprint canoe and canoe slalom
• C1 (classification), a para-cycling classification
• Class One offshore powerboat racing, abbreviated "C1"
• 'C1', the top category in Group C sportscar racing, used between 1985 and 1990
• C1, the UEFA Champions League (formerly known as the European Cup) in football
  • Serie C1, the third highest football league in Italy until 2008

Other uses

• C1, an international standard paper size defined in ISO 216 (648×917 mm)
• Bills C-1 and S-1, a pro forma bill normally introduced at the start of a parliamentary session in the Canadian House of Commons
• C1, also known as Vlakplaas, a unit of the South African Police responsible for assassinating opponents of Apartheid during the 1980s
• C1, a level in the Common European Framework of Reference for Languages
• C1, the use class for hotels, in town and country planning in the United Kingdom
• C1, a NRS social grade in the UK for the lower middle class
• A 2001 1.3 megapixels Olympus digital camera model
• A class of FM radio broadcasting in North America
• C1 pylon, a type of high voltage pylon
• Caldwell 1 (NGC 188), an open cluster in Cepheus
• C-1 visa, a type of visa for individuals transiting through the US
• C1 Espresso, café in Christchurch, New Zealand
• Capital One, an American banking company
• Alpha Centauri Ab, formerly called Candidate 1

See also

• CL (disambiguation)
• CI (disambiguation)
• 1C (disambiguation)