C90
# C90

C90 or C-90 may refer to:

## Science and technology

* Multiple myeloma and malignant plasma cell neoplasms (ICD-10 code)
* Caldwell 90 (NGC 2867), a planetary nebula in the constellation Carina
* $C_{90},$ the conventional electrical unit for the coulomb
* C90 audio cassette, a blank audio cassette in the very popular 90 (2 x 45) minute length

### Computing

* Cray C90, a supercomputer
* C90 (C version), a standardized ISO C form of the C programming language, virtually the same as the ANSI C ("C89") standard

## Transportation

* Beechcraft C90 King Air, an aircraft
* Continental C90, an aircraft engine
* Honda Super Cub, an underbone motorcycle designated C90 in a 90 cc version
* Chicago terminal radar approach control, (FAA designation C90); See Air traffic control

## Other uses

* C90-CR (M3), a rocket launcher
* Ruy Lopez chess openings (ECO code)
