Editing C9

'''C9''', '''C09''' or '''C-9''' may refer to:
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==Biology, medicine, and chemistry==
* C9 ([[Complement component 9]]), a protein
* [[ATC code C09]], a subgroup of the Anatomical Therapeutic Chemical Classification System
* C09, ICD-10 code for [[Head and neck cancer|malignant neoplasm of tonsil]]
* [[Carbon-9]] (C-9 or <sup>9</sup>C), an isotope of carbon

==Military and weapons==
* Hi-Point [[Models C9 and C9 Comp]] handguns
* [[C9 LMG]], Canadian light machine gun
* C9, an ID for the German [[Nachtjagdgeschwader 5|''Nachtjagdgeschwader'' 5]] air squadron in World War II

==Music==
* C9, a note five octaves above [[Middle C]]
* C9, a C [[ninth chord]]

==Organizations==
* [[Cloud9 (esports organization)|Cloud9]], an American esports organization
* [[C9 League]], an association of Chinese universities
* The [[Council of Cardinal Advisers]], an advisory body to the pope, originally comprising nine members
*[[C9 Entertainment]], a South Korean entertainment company and record label

==Transportation==
* [[Cierva C.9]], a 1927 British experimental autogyro 
* [[HMS C9|HMS ''C9'']], a British submarine
* [[Ford C-9]], a US military designation for the Ford Trimotor aircraft
* [[McDonnell Douglas C-9]], a US Air Force transport aircraft based on the civilian DC-9
* [[USS Montgomery (C-9)|USS ''Montgomery'' (C-9)]], a US Navy cruiser
* C9, the IATA code for [[Cirrus Airlines]]
* [[Sauber C9]], a Le Mans racing car
* C9 engine, by [[Caterpillar Inc.]]
* [[C-9 (Cercanías Madrid)]], a commuter rail line in [[Madrid]]
* [[LNER Class C9]], a class of 2 British steam locomotives rebuilt from C7s in 1931
* [[SL C9]], a type of rolling stock used in the Stockholm metro

==Other uses==
* C9, an [[ISO 216]] standard paper size
* C9, a [[holiday lighting technology|holiday light bulb]] size
* C9, a sportswear line by [[Champion (sportswear)|Champion]]

==See also==
* [[9C (disambiguation)]]

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