title: C90
text: # 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)
  