UM or um may refer to:

Universities

Businesses

Science and technology

  • .um, the Top-Level Domain for United States Minor Outlying Islands
  • Um interface, the air interface for the GSM mobile telephone standard
  • Micrometre (μm), sometimes written as "um" in limited character sets
  • Unified Model, a global numerical weather prediction model
  • Ultrarapid metabolizer, a term used in pharmacogenomics to refer to individuals with substantially increased metabolic activity
  • User manual, a document or manual intended to give assistance to people using a particular system
  • Utilization management, the evaluation of the appropriateness, medical need and efficiency of health care

Other uses

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