
Unaccompanied Minor. Underage passenger (typically 5-15 years old) travelling without a parent, guardian or trusted adult. An UM is under the constant supervision of airline staff from the departure gate until he or she is picked up at the arrival airport.
Found on
http://airodyssey.net/reference/glossary/
[cuneiform] The cuneiform alphabetic um sign, also dup, tup, ṭup, and DUB, the sumerogram-(logogram), for Akkadian language `ṭuppu`, (= the clay tablet), is found in both the 14th century BC Amarna letters and the Epic of Gilgamesh. In the Amarna letters as um, it is found as um-ma in the introduction of the letters as `Message (thus)`....
Found on
http://en.wikipedia.org/wiki/Um_(cuneiform)

The two-character ISO 3166 country code for UNITED STATES MINOR OUTLYING ISLANDS.
Found on
http://www.duke.edu/~charvey/Classes/wpg/bfglosu.htm

See Utilization Management.
Found on
http://www.encyclo.co.uk/local/20102

Symbol for micromolar. ... Symbol for micrometer. ... (05 Mar 2000) ...
Found on
http://www.encyclo.co.uk/local/20973

Unified Messaging - concept of taking various formats of message e.g. voicemail, email and making them available via one delivery mechanism.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

In GSM, the air interface reference point between BTS and MS, corresponding to Uu in UMTS UTRAN.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

(used as an expression of doubt, hesitation, deliberation, interest, etc.)
Found on
https://www.infoplease.com/dictionary/um

The currency symbol for the ouguiya ( q.v. ).
Found on
https://www.photius.com/countries/mauritania/glossary/index.html
No exact match found.