What does dum stand for?

Dutch, Middle - MARC language code - Library of Congress (LCCP)

Deep Underwater Missile (SAUS)

Died Unmarried - Genealogy

Disc User Multi-Access Unit (NITA)

Dorsal Unpaired Median (PDAA)

Drum-I-Oto Canoe Company, Blair, WI - Manufacturer code for watercraft hull identification number (USCG)

Dublin University Mission

Dumb UTP Mini-hub (SAUS)

Dumb UTP Multiport repeater (SAUS)

Dummy (MSA)

Dumont D'Urville - France - Geomagnetic observatory code

Gonja - Language code (ETLW)