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


Arts and media

* C1, a
note-octave Scientific pitch notation (SPN), also known as American standard pitch notation (ASPN) and international pitch notation (IPN), is a method of specifying musical Pitch (music), pitch by combining a musical Note (music), note name (with accidental ( ...
in music *
C1 Television C1 Television (), 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 programming C1 Televi ...
, a Mongolian television channel *
Cinema One Cinema One (also called C1 and stylized as C1NEMAONE) is a Philippine pay television channel targeted to the Filipino diaspora. It is owned by Creative Programs Inc., a subsidiary of Philippine media conglomerate ABS-CBN Corporation. Its prog ...
, Philippine pay TV channel *
Schecter C-1 Hellraiser FR Schecter Guitar Research, commonly known simply as Schecter, is an American manufacturing company founded in 1976 by David Schecter, which originally produced only replacement parts for existing guitars from manufacturers such as Fender Musical I ...
, a guitar model * A
Yamaha Yamaha may refer to: People * Torakusu Yamaha, a Japanese businessman and founder of the Yamaha Corporation Companies * Yamaha Corporation, a Japanese musical instrument and audio equipment manufacturer ** Yamaha Music Foundation, an organi ...
grand piano model * "C1", a slang expression in the video game ''
Counter-Strike ''Counter-Strike'' (''CS'') is a series of multiplayer tactical first-person shooter video games, in which opposing teams attempt to complete various objectives. The series began on Windows in 1999 with the release of the first game, '' Counte ...
'', used to express agreement


Biology and medicine


Anatomy

*
Cervical vertebra 1 In anatomy, the atlas (C1) is the most superior (first) cervical vertebra of the spine (anatomy), spine and is located in the neck. The bone is named for Atlas (mythology), Atlas of Greek mythology, just as Atlas bore the weight of the heavens ...
, 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.C1 complex The C1 complex (''complement component 1'', ''C1'') is a protein complex involved in the complement system. It is the first component of the classical complement pathway and is composed of the subcomponents C1q, C1r and C1s. Structure The C ...
, the first component of the classical complement pathway *
C1 domain C1 domain (also known as phorbol esters/diacylglycerol binding domain) binds an important secondary messenger diacylglycerol (DAG), as well as the analogous phorbol esters. Phorbol esters can directly stimulate protein kinase C, PKC. Phorbol es ...
, an important secondary messenger protein domain *
C1-inhibitor C1-inhibitor (C1-inh, C1 esterase inhibitor) is a protease inhibitor belonging to the serpin superfamily. Its main function is the inhibition of the complement system (C1r, C1s) to prevent spontaneous activation but also as the major regulator ...
, a human serine protease inhibitor * C1 regulatory sequence 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, ...
, a human lipoprotein * Chlorophyll c1, a form of chlorophyll *
Cytochrome C1 Cytochrome C1 (also known as Complex III subunit 4) is a protein encoded by the '' CYC1'' gene. Cytochrome is a heme-containing subunit of the cytochrome b-c1 complex, which accepts electrons from Rieske protein and transfers electrons to cytoc ...
, 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) 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 the ...
, 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 Oral cancer, also known as oral cavity cancer, tongue cancer or mouth cancer, is a cancer of the lining of the lips, mouth, or upper throat. In the mouth, it most commonly starts as a painless red or white patch, that thickens, gets ulcerated ...
* C1, the short name for a microfluidic single-cell analysis system sold by
Fluidigm Standard BioTools Inc., previously known as Fluidigm Corp., is an American life science tools company that offers analytical mass cytometry systems for flow cytometry and tissue imaging, along with associated assays and reagents, as well as an a ...


Chemistry

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


Computing


Hardware

*
C-One The C-One is a single-board computer (SBC) created in 2002 as an enhanced version of the Commodore 64, a home computer popular in the 1980s. Designed by Jeri Ellsworth and Jens Schönfeld from Individual Computers, who manufactured the boards ...
, a single-board microcomputer *
C1 NES TV The Nintendo Entertainment System (NES), an 8-bit third-generation home video game console produced by Nintendo, had numerous model variants produced throughout its lifetime. It was originally released in 1983 as the (and widely known as the ) in ...
, a family of Nintendo-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 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) Punter is a protocol for file transfer developed in the 1980s by Steve Punter. There are various types of Punter such as PET Transfer Protocol (''PTP''), ''C1'' and ''C2''. PET Transfer Protocol The PET Transfer Protocol (''PTP''), also known ...
, 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 TC ...
C1 security class * A CPU power state in the
Advanced Configuration and Power Interface Advanced Configuration and Power Interface (ACPI) is an open standard that operating systems can use to discover and configure computer hardware components, to perform power management (e.g. putting unused hardware components to sleep), auto con ...


Mathematics

* C^1, the set of all
continuously differentiable In mathematics, a differentiable function of one Real number, real variable is a Function (mathematics), function whose derivative exists at each point in its Domain of a function, domain. In other words, the Graph of a function, graph of a differ ...
functions * C1 field, a quasi-algebraically closed field * C1, the first of four pure modules taken in the
Advanced Level (UK) The A-level (Advanced Level) is a main school leaving qualification of the General Certificate of Education in England, Wales, Northern Ireland, the Channel Islands and the Isle of Man. It is available as an alternative qualification in othe ...
Maths syllabus


Transportation


Air

* C-1 Trader, 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 built by the (AEG) during the First World War for the Imperial German Army's () Imperial German Air Service (). It was a modified version of the B.II training aircraft with a machine gu ...
, 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, a 1920 Spanish experimental autogyro * DFW C.I, a WWI German reconnaissance aircraft *
Douglas C-1 The Douglas C-1 was a cargo/transport aircraft produced by the Douglas Aircraft Corporation for the United States Army Air Service starting in 1925. Design and development Douglas received an order for nine single-engined transport aircraft in 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 The Kawasaki C-1 (川崎 C-1) is a twin-engined short-range military transport aircraft developed and manufactured by the Japanese conglomerate Kawasaki Heavy Industries. It is solely used by the Japan Air Self-Defense Force (JASDF). Developme ...
, an indigenous transport aircraft of the Japanese Air Self-Defense Forces * 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) 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 which comprise the first and innermost beltway of Metro Manila in the Philippines. Spanning some , it connects the districts of Ermita, Intramuros, S ...
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 23 special wards, wards of Chiyoda, Tokyo, Chiyoda, Chūō, T ...
, 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 The BMW C1 is an enclosed Scooter (motorcycle), scooter made by Gruppo Bertone, Bertone for BMW Motorrad, BMW. Compared to a conventional scooter, the C1 offered extra safety features and protection from the elements. The rider would sit in a car- ...
, 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 called the "solid-axle" generation, as an ...
, 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 al ...
, a small car *
Ford C1 platform The Volvo P1/Mazda BK/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 20 ...
, 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 Sauber Motorsport AG, currently competing in Formula One as Stake F1 Team Kick Sauber, and also known simply as Kick Sauber or Sauber, is a Swiss motorsport engineering company. It was founded in 1970 (as PP Sauber AG) by Peter Sauber, who pro ...
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 is the chair of the Cabinet of Australia and thus the head of the Australian Government, federal executive government. Under the pr ...
's official VIP transportation * A type of
heavy goods vehicle A large goods vehicle (LGV), or heavy goods vehicle (HGV), in the European Union (EU) is any lorry with a gross combination mass (GCM) of over . Sub-category N2 is used for vehicles between 3,500 kg and and N3 for all goods vehicles over ...
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 to standardize the signing system for road traffic (road signs, traffic lights and road markings) in use inte ...


Rail

* Bavarian C I, an 1847 German steam locomotives class * GNR Class C1 (small boiler), a British 4-4-2 steam locomotive class (classified C2 during LNER ownership) *
GNR Class C1 (large boiler) The Great Northern Railway (GNR) Class C1 is a type of 4-4-2 steam locomotive. One, ex GNR 251 (later LNER 3251 in 1924, and LNER 2800 in 1946), survives in preservation. Much like their small boiler cousins, they were capable of reaching sp ...
, 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 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 class *
PRR C1 The PRR C1 was the Pennsylvania Railroad's class of steam locomotive, used in switching service. The locomotive type was built at the railroad's Juniata shops in Altoona, Pennsylvania and introduced in 1925. The 0-8-0 was common on most railr ...
, 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 Type C1 was a designation for 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 Maritim ...
, a small cargo vessel built by the United States in large numbers before and during World War II * ''
Isaac Peral Isaac Peral y Caballero (1 June 1851, in Cartagena – 22 May 1895, in Berlin), was a Spanish engineer, naval officer, and designer of the submarine . He joined the Spanish Navy in 1866, and developed the first electric-powered submarine which ...
'' (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 watercraft, 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 paddles. In British English, the term ' ...
discipline including
sprint canoe A sprint canoe is a canoe used in International Canoe Federation canoe sprint. It is an open boat propelled by one, two or four paddlers from a kneeling position, using single-bladed paddles. The difficulty of balance can depend on how wide or n ...
and
canoe slalom Canoe slalom (previously known as whitewater slalom) is a competitive sport with the aim to navigate a Spraydeck, decked canoe or kayak through a course of hanging downstream or upstream gates on Whitewater, river rapids in the fastest time pos ...
*
C1 (classification) C1 is a para-cycling classification. recommends this be coded as MC1 or WC1. Definition PBS defined this classification as "Cyclists with upper or lower limb disabilities and most severe neurological disfunction." ''The Daily Telegraph'' defi ...
, 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 car racing, touring cars and ''Group B'' for Grand tourer, GTs. It was designed to replace both Group 5 (motorspor ...
sportscar racing, used between 1985 and 1990 * C1, the
UEFA Champions League The UEFA Champions League (UCL) is an annual club association football competition organised by the UEFA, Union of European Football Associations (UEFA) that is contested by List of top-division football clubs in UEFA countries, top-divisio ...
(formerly known as the European Cup) in football **
Serie C1 Serie C1 was the third highest football league in Italy. It consisted of 36 teams, divided geographically into two divisions. History Before the 1978–79 season, there were only three professional football leagues in Italy, the third being Se ...
, 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, which includes the A4, the most commonly availabl ...
(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. Bein ...
, 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 (an Afrikaans term meaning "flat 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 (South Africa), Security Branch of the apartheid-era 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, CEF, or CEFRL, is a guideline used to describe achievements of learners of foreign languages across Europe and, increasingl ...
* 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 UK 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 planni ...
* 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 have since been used by many other organisations for w ...
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 (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It ...
, a type of visa for individuals transiting through the United States * C1 Espresso, café in Christchurch, New Zealand *
Capital One Capital One Financial Corporation is an American bank holding company founded on July 21, 1994, and specializing in credit cards, auto loans, banking, and savings accounts, headquartered in Tysons, Virginia, with operations primarily in the ...
, an American banking company


See also

*
Cl (disambiguation) CL or cl may refer to: Arts and entertainment * CL (rapper), (born Lee Chae-rin, 1991), singer and rapper, leader of the K-pop girl group 2NE1 * Creative Loafing, a newspaper publisher Brands and enterprises * Colgate-Palmolive's NYSE stock ...
*
CI (disambiguation) CI or Ci may refer to: Business terminology * Commercial invoice * Competitive intelligence * Confidential information * Continual improvement * Corporate identity * Customer intelligence, a discipline in marketing Businesses and organisations ...
* 1C (disambiguation) {{Letter–number combination disambiguation