What is "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.

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.

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