H21

H21 or H-21 may refer to :

British NVC community H21, a type of heath community in the British National Vegetation Classification
Highway H21 (Ukraine), a road in Ukraine
HMS H21, a 1918 British Royal Navy H-class submarine
Piasecki H-21, a 1949 American helicopter

and also :

H-21, the 1917 German Mata Hari spy code name
Other disorders of iris and ciliary body ICD-10 code

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