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

Arts and media

* C1, a note-octave in music *

C1 Television C1 Television ( mn, С1 Телевиз), or C1, is a television broadcaster in Mongolia. History Channel 1 television was founded on 24 April 2006. According to the station, it is the first in Mongolia to use fully digital video processing. TV ...

, 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 Yamaha may refer to: * Yamaha Corporation, a Japanese company with a wide range of products and services, established in 1887. The company is the largest shareholder of Yamaha Motor Company (below). ** Yamaha Music Foundation, an organization estab ...

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 The cervical spinal nerve 1 (C1) is a spinal nerve of the cervical segment. ...

, 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 Procyanidin C1 (PCC1) is a B type proanthocyanidin. It is an epicatechin trimer found in grape (''Vitis vinifera''), unripe apples, and cinnamon. Natural occurrence and function Procyanidin C1 can be isolated from grape seed extract. Chemical ...

, 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) The C1 and P1 (also called the P100) are two human scalp-recorded event-related brain potential (event-related potential (ERP)) components, collected by means of a technique called electroencephalography (EEG). The C1 is named so because it was th ...

, 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 Standard BioTools Inc. (formerly Fluidigm) is an American company engaged in the design, manufacture and sale of biological research equipment based on integrated fluidic circuit technology. The company's founders leveraged their semiconductor ...

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 The C0 and C1 control code or control character sets define control codes for use in text by computer systems that use ASCII and derivatives of ASCII. The codes represent additional information about the text, such as the position of a cursor, ...

defined in ISO 6429 * C1 (protocol), a 1984 protocol for file transfer, also known as "Punter" *

TCSEC Trusted Computer System Evaluation Criteria (TCSEC) is a United States Government Department of Defense (DoD) standard that sets basic requirements for assessing the effectiveness of computer security controls built into a computer system. The TCS ...

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) The General Certificate of Education (GCE) Advanced Level, or A Level, is a main school leaving qualification in England, Wales, Northern Ireland, the Channel Islands and the Isle of Man. It is available as an alternative qualification in other ...

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 The AEG C.I was a two-seat biplane reconnaissance aircraft produced in small numbers from March 1915 by the German company Allgemeine Elektrizitäts-Gesellschaft (AEG). It was essentially an AEG B.II armed with a single 7.92 mm (.312 in ...

, a German World War I reconnaissance aircraft *

AGO C.I The AGO C.I was a First World War German pusher reconnaissance biplane that used a pod-and-boom configuration. Development The crew and pusher engine shared a central nacelle, and the twin booms carried the tail and the four-wheeled landing ge ...

, 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 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, 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 The Fokker C.I was a German reconnaissance biplane under development at the end of World War I. The design was essentially an enlarged Fokker D.VII fighter with two seats and a 138 kW (185 hp) BMW IIIa engine. The C.I was originally dev ...

, 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) Southern Cross Airport is a public-use airport located southwest of the central business district of the Williamstown section of Monroe Township, Gloucester County, New Jersey Monroe Township is a township in Gloucester County, in the ...

(FAA LID: C01)

Land

Routes

Circumferential Road 1 Circumferential Road 1 (C-1), informally known as the C-1 Road, is a network of roads and bridges that all together form the first and innermost beltway of Metro Manila in the Philippines. Spanning some , it connects the districts of Ermita, Intram ...

or C-1, an arterial road of Manila, Philippines * London Buses route C1 *

Route C1 (Shuto Expressway) The , signed as Route C1, is one of the routes of the Shuto Expressway system serving the central part of the Greater Tokyo Area. The route is a complete loop around the central Tokyo wards of Chiyoda, Chūō, and Minato, with a total length ...

, the Inner Loop of Tokyo's Shuto Expressway system * Claro M. Recto Avenue, a road in Metro Manila, Philippines *

Massachusetts State Route C1 In the U.S. state of Massachusetts, U.S. Route 1 (US 1) is a major north–south route through Essex, Middlesex, Suffolk, Norfolk, and Bristol Counties. The portion of US 1 south of Boston is also known as the Boston-Providence Turnpike, ...

Land vehicles

* BMW C1, a cabin scooter *

Chevrolet Corvette C1 The Chevrolet Corvette (C1) is the first generation of the Corvette sports car produced by Chevrolet. It was introduced late in the 1953 model year, and produced through 1962. This generation is commonly referred to as the "solid-axle" generati ...

, first generation sold from 1953 to 1962, denoted a solid-axle rear-end *

Citroën C1 The Citroën C1 is a city car marketed by Citroën from June 2005 to January 2022, originally developed as part of the B-Zero project by PSA Peugeot Citroën in a joint venture with Toyota, with two generations produced. The C1 was developed alo ...

, 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 The Convention on Road Signs and Signals, commonly known as the Vienna Convention on Road Signs and Signals, is a multilateral treaty designed to increase road safety and aid international road traffic by standardising the signing system for roa ...

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 The 1868 Steam Locomotive Class C1s used in the Grand Duchy of Finland, an autonomous part of the Russian Empire until 1917, were typical of the Victorian principles of locomotive design and the British 0-6-0 of the period, with inside cylinders ...

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 Type C1 was a designation for small cargo ships built for the United States Maritime Commission before and during World War II. Total production was 493 ships built from 1940 to 1945. The first C1 types were the smallest of the three original M ...

, 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 A canoe is a lightweight narrow water vessel, typically pointed at both ends and open on top, propelled by one or more seated or kneeling paddlers facing the direction of travel and using a single-bladed paddle. In British English, the term ...

discipline including sprint canoe and

canoe slalom Canoe slalom (previously known as whitewater slalom) is a competitive sport with the aim to navigate a decked canoe or kayak through a course of hanging downstream or upstream gates on river rapids in the fastest time possible. It is one of th ...

* 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 Group C was a category of sports car racing introduced by the FIA in 1982 and continuing until 1993, with ''Group A'' for touring cars and ''Group B'' for GTs. It was designed to replace both Group 5 special production cars (closed top touri ...

sportscar racing, used between 1985 and 1990 * C1, the

UEFA Champions League The UEFA Champions League (abbreviated as UCL, or sometimes, UEFA CL) is an annual club football competition organised by the Union of European Football Associations (UEFA) and contested by top-division European clubs, deciding the competit ...

(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 Bills C-1 and S-1 are ''pro forma'' bills introduced in the House of Commons and Senate respectively at the opening of each session of the Parliament of Canada. The bills are given a first reading and are then never proceeded with further. Being ...

, a ''pro forma'' bill normally introduced at the start of a parliamentary session in the Canadian House of Commons * C1, also known as

Vlakplaas Vlakplaas (trans. "shallow farm") is a farm 20 km west of Pretoria that served as the headquarters of counterinsurgency unit C1 (later called C10) of the Security Branch of the apartheid-era South African Police. Though officially called S ...

, 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 Town and country planning in the United Kingdom is the part of English land law which concerns land use planning. Its goal is to ensure sustainable economic development and a better environment. Each country of the United Kingdom has its own pla ...

* C1, a

NRS social grade The NRS social grades are a system of demographic classification used in the United Kingdom. They were originally developed by the National Readership Survey (NRS) to classify readers, but are now used by many other organisations for wider appli ...

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 type of high voltage pylon * Caldwell 1 ( NGC 188), an open cluster in Cepheus *

C-1 visa The C-1 visa is a type of visa reserved for immediate and continuous transit through the United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily locate ...

, a type of visa for individuals transiting through the United States