Um

Um may refer to:

• Um, an exclamation or filled pause in spoken conversation
• Um (Korean name)
• .um, the Top Level Domain for United States Minor Outlying Islands
• μm for micrometre, sometimes used with a limited character set
• Um interface, the air interface for the GSM mobile telephone standard
• Unofficial magistrate, as a postnominal

UM may refer to:

• UM (company), an advertising agency formerly known as Universal McCann
• Utilization management, the evaluation of the appropriateness, medical need and efficiency of health care
• Air Zimbabwe, IATA code UM
• United Methodist
• Unified Messaging
• The Union for the Mediterranean
• United States Minor Outlying Islands, ISO 3166 code UM
• Umphrey's McGee, a jam band
• Unified Model, a global numerical weather prediction model

https://en.wikipedia.org/wiki/Um