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 *

Schecter C-1 Hellraiser FR The Schecter C-1 Hellraiser FR is a guitar model made by Schecter Guitar Research. The model properties include a mahogany body with a quilted maple top, an Original Floyd Rose and EMG active Humbucker A humbucking pickup, humbucker, or ...

, 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 Transcription (biology), Transcription of insulin is regulated by the binding of various transcription factors to the ~400 base pairs before the insulin transcription start site, called the "insulin regulatory sequence". This sequence is made up of ...

for the insulin gene *

Apolipoprotein C1 Apolipoprotein C-I is a protein component of lipoproteins that in humans is encoded by the ''APOC1'' gene. Function The protein encoded by this gene is a member of the apolipoprotein C family. This gene is expressed primarily in the liver, an ...

, a human lipoprotein *

Chlorophyll c1 Chlorophyll ''c'' is a form of chlorophyll found in certain marine algae, including the photosynthetic Chromista (e.g. diatoms and brown algae) and dinoflagellates. It has a blue-green color and is an accessory pigment, particularly significan ...

, a form of chlorophyll * Cytochrome C1, a precursor protein to Cytochrome C * Proanthocyanidin C1, a type of polyphenolic compound *

Prostaglandin C1 In enzymology, a Prostaglandin-A1 Δ-isomerase () is an enzyme that catalyzes the chemical reaction :(13E)-(15S)-15-hydroxy-9-oxoprosta-10,13-dienoate \rightleftharpoons (13E)-(15S)-15-hydroxy-9-oxoprosta-11,13-dienoate Hence, this enzyme has one ...

, 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 * C01, the ICD-10 code for "malignant neoplasm of base of tongue", a form of oral cancer * C1, the short name for a microfluidic single-cell analysis system sold by Fluidigm

Chemistry

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

Computing

Hardware

* C-One, a single-board microcomputer * C1 NES TV, a family of Nintendo-television-set hybrids manufactured by Sharp Corporation in 1983 * ATI C1, codename of the Xbox 360 GPU Xenos

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 In mathematics, a differentiable function of one real variable is a function whose derivative exists at each point in its domain. In other words, the graph of a differentiable function has a non-vertical tangent line at each interior point in its ...

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 The Grumman C-1 Trader is a carrier onboard delivery (COD) variant of the Grumman S-2 Tracker. It was replaced by a similar version of the Northrop Grumman E-2 Hawkeye, the Grumman C-2 Greyhound. Design and development The C-1 Trader grew out ...

, a cargo-version of the S-2 Tracker anti-submarine warfare aircraft of the United States Navy * AEG C.I, a German World War I reconnaissance aircraft * AGO C.I, a 1915 German reconnaissance biplane *

Albatros C.I The Albatros C.I, (post-war company designations L.6 & L.7), was the first of the successful C-series of two-seat general-purpose biplanes built by Albatros Flugzeugwerke during World War I. Based on the unarmed Albatros B.II, the C.I reversed ...

, a 1915 German two-seat general-purpose biplane * Aviatik C.I, a 1915 German observation plane *

Cierva C.1 The Cierva C.1 was an experimental autogyro built by Juan de la Cierva in Spain in 1920, the forerunner of his successful series of autogyros. The C.1 was created by taking the fuselage from a Deperdussin fixed-wing aircraft and mounting two ro ...

, a 1920 Spanish experimental autogyro *

DFW C.I __NOTOC__ The DFW C.I was a German reconnaissance aircraft produced during World War I. Derived from the company's DFW B.I, B.I design of 1914, the C.I kept the same basic fuselage design, but dispensed with the B.I's distinctive crescent-shaped ...

, 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 Friedrichshafen FF.33 was a German single-engined reconnaissance three-bay wing structure biplane, using twin floats, designed by Flugzeugbau Friedrichshafen in 1914 for the ''Marine-Fliegerabteilung'' aviation forces of the ''Kaiserliche Mar ...

, a 1914 German single-engined amphibious reconnaissance biplane *

Hansa-Brandenburg C.I The Hansa-Brandenburg C.I, also known as Type LDD, was a 2-seater armed single-engine reconnaissance biplane designed by Ernst Heinkel, who worked at that time for the parent company in Germany. The C.I had similarities with the earlier B.I (Typ ...

, a 1916 German 2-seater armed single-engine reconnaissance biplane * Kawasaki C-1, an indigenous transport aircraft of the Japanese Air Self-Defense Forces *

Otto C.I The Otto C.I, also known as the Otto KD.15, was a German two-seat biplane reconnaissance and bomber aircraft of the First World War designed and produced by Otto Flugmaschinenfabrik. The C.I was a rare example of an aircraft flown by the Central Po ...

, a 1915 German reconnaissance biplane *

Rumpler C.I Entering service in 1915, the Rumpler C.I, (company designation 5A 2), two-seater single-engine reconnaissance biplane, was one of the first German C-type aircraft, and also one of the longest serving in its class during World War I, being retired ...

, 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

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 Global C-car Platform is Ford's global compact car automobile platform. It replaces the Ford C170 platform and Mazda B platform (BJ). The C1 platform debuted with the European Ford Focus C-Max compact MPV in early 2004. The platform is ...

, the Ford Motor Company's global compact car automobile platform *

Lit C-1 Lit Motors Inc. is a San Francisco-based company that designed conceptual two-wheeled vehicles, including a fully electric, gyroscopically stabilized vehicle. Founded by Daniel K. Kim in 2010, Lit Motors designed concepts for two-wheeled vehicl ...

, 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 The prime minister of Australia is the head of government of the Commonwealth of Australia. The prime minister heads the executive branch of the Australian Government, federal government of Australia and is also accountable to Parliament of A ...

'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

Bavarian C I Bavarian C Is were steam locomotives with the Royal Bavarian State Railways (''Königlich Bayerische Staatsbahn''). They were the first six-coupled engines in Kingdom of Bavaria, Bavaria and were developed specially for the route between Neuenma ...

, an 1847 German steam locomotives class * GNR Class C1 (small boiler), a British 4-4-2 steam locomotive * GNR Class C1 (large boiler), a British 4-4-2 steam locomotive * 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 The North Eastern Railway (NER) Class C1, was a class of 0-6-0 freight locomotives designed by T.W. Worsdell. They were used throughout the NER system, although particularly in Teesside between 1886 and 1962. History Thirty examples were built ...

, a British 0-6-0 steam locomotive *

PRR C1 The PRR C1 was the Pennsylvania Railroad's class of 0-8-0 steam locomotive, used in switching service. The 0-8-0 was common on most railroads, but not on PRR; when the railroad needed bigger motive power, they used the 2-8-0 "Consolidation". The P ...

, an American PRR steam locomotive * Finnish Steam Locomotive Class C1

Sea

* , a C-class submarine of the Royal Navy * , a C-class submarine of the United States Navy * , a protected cruiser of the United States Navy * Type C1 ship, a small cargo vessel built by the United States in large numbers before and during World War II * '' Isaac Peral'' (C-1), a Spanish submarine

Space

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

Sports

* C1, a solo canoe discipline including sprint canoe and canoe slalom * C1 (classification), a para-cycling classification * C1, an abbreviation for Class One

offshore powerboat racing Offshore powerboat racing is a type of racing by ocean-going powerboats, typically point-to-point racing. In most of the world, offshore powerboat racing is led by the Union Internationale Motonautique (UIM) regulated Class 1 and Powerboat P1. ...

* '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 Lega Pro Prima Divisione was the third highest football (soccer), football league in Italy. It consisted of 33 teams, divided geographically into two divisions of 16 and 17 teams for group A and B respectively. Until 2008 it was known as Serie C1 ...

, the third highest football league in Italy until 2008

Other uses

* C1, an international standard paper size defined in

ISO 216 ISO 216 is an international standard for paper sizes, used around the world except in North America and parts of Latin America. The standard defines the "A", "B" and "C" series of paper sizes, including A4, the most commonly available paper size ...

(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 The Common European Framework of Reference for Languages: Learning, Teaching, Assessment, abbreviated in English as CEFR or CEF or CEFRL, is a guideline used to describe achievements of learners of foreign languages across Europe and, increasing ...

* C1, the use class for hotels, in town and country planning in the United Kingdom * C1, a NRS social grade in the United Kingdom 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 transmission tower, also known as an electricity pylon or simply a pylon in British English and as a hydro tower in Canadian English, is a tall structure, usually a steel lattice tower, used to support an overhead power line. In electrical ...

, a type of high voltage pylon * Caldwell 1 (

NGC 188 NGC 188 (also known as Caldwell 1) is an open cluster in the constellation Cepheus. It was discovered by John Herschel in 1825. Unlike most open clusters that drift apart after a few million years because of the gravitational interaction of our ...

), an open cluster in Cepheus * C-1 visa, a type of visa for individuals transiting through the United States