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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 hf
 high frequency（高頻）的簡寫

From: WordNet (r) 2.0

 Hf
      n 1: a gray tetravalent metallic element that resembles zirconium
           chemically and is found in zirconium minerals; used in
           filaments for its ready emission of electrons [syn: hafnium,
            atomic number 72]
      2: 3 to 30 megahertz [syn: high frequency]