H0

H0 (h + number zero) or H00 may refer to :
* H0 scale (h + letter zero), a model railroad scale
* HMCS Restigouche (H00), a 1938 Royal Canadian Navy River-class destroyerand also :
* Hubble constant, a measure of the expansion rate of the Universe
* Null hypothesis, in statistics
* Stye ICD-10 code