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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
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
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 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 United States 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
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

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

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), 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

HMS C1, a C-class submarine of the Royal Navy
USS C-1 (SS-9), a C-class submarine of the United States Navy
USS Newark (C-1), 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
'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 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, a type of visa for individuals transiting through the United States
C1 Espresso, café in Christchurch, New Zealand

C1