4H

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4H stands for:

Polytype 4H of silicon carbide
very hard , see degree of hardness (pencil)
United Airways (IATA code), Bangladeshi airline
Fly Linhas Aéreas (IATA code), Brazilian airline
⁴ H , the natural isotope of helium
Name for the four Dutch municipalities Hiaure , Hantum , Hantumeruitburen and Hantumhuizen

4-H stands for:

4-H

See also:

H4