What does 10-21 stand for?
10-21 stands for "Call X for Subsequent Number"
How to abbreviate "Call X for Subsequent Number"?
"Call X for Subsequent Number" can be abbreviated as 10-21
What is the meaning of 10-21 abbreviation?
The meaning of 10-21 abbreviation is "Call X for Subsequent Number"
What does 10-21 mean?
10-21 as abbreviation means "Call X for Subsequent Number"
