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Wikipedia

HMM

HMM may refer to:

  • Central Mashan Miao language, spoken in China
  • Hallmark Movies & Mysteries, a U.S. cable channel
  • Hammerton railway station, England, National Rail
  • Hatch Mott MacDonald, a North American engineering consulting firm
  • Heavy meromyosin, a protein fragments
  • Heavy metal music, a subgenre of rock music
  • Heroes of Might and Magic, a video game series
  • Hidden Markov model, a statistical model
  • Homenmen, an Armenian sporting organization
  • Hum (sound), a wordless vocalization
  • Hyundai Merchant Marine, a South Korean logistics company
  • High-end Master Model, a high-quality Zoids model kit
  • Hail Mary Mallon, an American hip-hop group
Douglas Harper's Etymology Dictionary

hmm

representative of a sound made during contemplation or showing mild disapproval, attested from 1868, but this is probably a variation of the hum attested in similar senses from 1590s.

Wiktionary

hmm

interj. 1 Indicating thinking or pondering. 2 A demand for an answer to a question. vb. (context intransitive English) To make a thoughtful humming noise.