What does UM stand for?
UM stands for "Unacknowledged Mode"
How to abbreviate "Unacknowledged Mode"?
"Unacknowledged Mode" can be abbreviated as UM
What is the meaning of UM abbreviation?
The meaning of UM abbreviation is "Unacknowledged Mode"
What does UM mean?
UM as abbreviation means "Unacknowledged Mode"