C9
C9, C09 or C-9 may refer to:
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 malignant neoplasm of tonsil
- Carbon-9 (C-9 or 9C), an isotope of carbon
- Coccinella novemnotata, the nine-spotted ladybug or C9, a species of lady beetle
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 air squadron in World War II
Music
- C9, a note five octaves above Middle C
- C9, a C ninth chord
Organizations
- 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, 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), 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
- Omoda C9, a Chinese mid-size crossover SUV
Other uses
- C9, an ISO 216 standard paper size
- C9, a holiday light bulb size
- C9, a sportswear line by Champion
See also
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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