C1
Wikimedia disambiguation page
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
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 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.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q226890. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1983.
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This entry incorporates text from “C1” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.