Yes sir~ <-- weird? O.o  A long time ago I made an idol groups acronyms part 1 and thought that I should continue with it :p I stoped at the letter N = NU'EST.

SS501 - Superstar, Singers, 5, 0, and 1 symbolizes "five members united as one forever"
SHU-I - So Hot Union for Idols
SPEED - "Continue the race without getting tired" <-- the story behind it

The BOSS  (a.k.a DGNA) - The Boys Of Super Space
TOUCH - The Original Undeniable Charismatic Homme
TRAX - Typhoon of the Rose Attack on X-Mas
TWI-Light - Trend World Idol-Light

U-Kiss - Ubiquitous Korean International idol Super Star

VIXX - Voice, Visual, Value In Excelsis

X5 - Xenos Five

ZE:A - Children of Empire

Well these was some... special acronyms =_= Pretty far fetched but... yeah.

However I have to love these groups who has an "ego" meaning behind their acronyms for example SHU-I and TOUCH ;'D While some groups such as SS501 and SPEED has a deep meaning/thought behind it :3
Well this was probably the last Idol groups acronyms for boy groups but I'm going to continue with the ladies~ ^3^