D50
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D50, D-50 or D 50 may refer to:
- D50 (radiotherapy), the half maximal inhibitory dose, representing the dose of light or ionising radiation that is required for 50% inactivation of a tumor cell population
- the ICD-10 code for Iron deficiency anemia
- An intravenous sugar solution of 50% dextrose
- JNR Class D50, a pre-war Japanese steam locomotives class related to the D60 steam locomotive class
- New South Wales D50 class locomotive, a NSWGR steam locomotive
- Lancia D50, a Formula One racing car that competed between 1954 and 1956, winning Juan Manuel Fangio the 1956 World Driver's Championship.
- CIE Standard Illuminant D50, a lighting standard used in colorimetry, and also in graphic design as a white point
- Nikon D50, an entry-level digital SLR camera
- Roland D-50, a digital synthesizer from 1987 to 1990
- Invisible D50, a keyboard stand from 1985 to 1990
- D50 road (Croatia), a state route
- D50, in particle size distribution measurements, the mass-median-diameter, considered to be the average particle size by mass.