# C9

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> Source: https://en.wikipedia.org/wiki/C9
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> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

**C9**, **C09** or **C-9** may refer to:

## Biology, medicine, and chemistry

- C9 ([Complement component 9](/source/Complement_component_9)), a protein
- [ATC code C09](/source/ATC_code_C09), a subgroup of the Anatomical Therapeutic Chemical Classification System
- C09, ICD-10 code for [malignant neoplasm of tonsil](/source/Head_and_neck_cancer)
- [Carbon-9](/source/Carbon-9) (C-9 or 9C), an isotope of carbon
- *[Coccinella novemnotata](/source/Coccinella_novemnotata)*, the nine-spotted ladybug or C9, a species of [lady beetle](/source/Lady_beetle)

## Military and weapons

- Hi-Point [Models C9 and C9 Comp](/source/Models_C9_and_C9_Comp) handguns
- [C9 LMG](/source/C9_LMG), Canadian light machine gun
- C9, an ID for the German [*Nachtjagdgeschwader* 5](/source/Nachtjagdgeschwader_5) air squadron in World War II

## Music

- C9, a note five octaves above [Middle C](/source/Middle_C)
- C9, a C [ninth chord](/source/Ninth_chord)

## Organizations

- [Cloud9](/source/Cloud9_(esports_organization)), an American esports organization
- [C9 League](/source/C9_League), an association of Chinese universities
- The [Council of Cardinal Advisers](/source/Council_of_Cardinal_Advisers), an advisory body to the pope, originally comprising nine members
- [C9 Entertainment](/source/C9_Entertainment), a South Korean entertainment company and record label

## Transportation

- [Cierva C.9](/source/Cierva_C.9), a 1927 British experimental autogyro
- [HMS *C9*](/source/HMS_C9), a British submarine
- [Ford C-9](/source/Ford_C-9), a US military designation for the Ford Trimotor aircraft
- [McDonnell Douglas C-9](/source/McDonnell_Douglas_C-9), a US Air Force transport aircraft based on the civilian DC-9
- [USS *Montgomery* (C-9)](/source/USS_Montgomery_(C-9)), a US Navy cruiser
- C9, the IATA code for [Cirrus Airlines](/source/Cirrus_Airlines)
- [Sauber C9](/source/Sauber_C9), a Le Mans racing car
- C9 engine, by [Caterpillar Inc.](/source/Caterpillar_Inc.)
- [C-9 (Cercanías Madrid)](/source/C-9_(Cercan%C3%ADas_Madrid)), a commuter rail line in [Madrid](/source/Madrid)
- [LNER Class C9](/source/LNER_Class_C9), a class of 2 British steam locomotives rebuilt from C7s in 1931
- [SL C9](/source/SL_C9), a type of rolling stock used in the Stockholm metro
- [Omoda C9](/source/Omoda_C9), a Chinese mid-size crossover SUV

## Other uses

- C9, an [ISO 216](/source/ISO_216) standard paper size
- C9, a [holiday light bulb](/source/Holiday_lighting_technology) size
- C9, a sportswear line by [Champion](/source/Champion_(sportswear))

## See also

- [9C (disambiguation)](/source/9C_(disambiguation))

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Adapted from the Wikipedia article [C9](https://en.wikipedia.org/wiki/C9) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/C9?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.