Most abbreviations make sense to me, but not all of them. These are the ones that make some sense to me: WTH (What The Heck), or YL (Young Lady), or XYL (Married Lady) [the last two are from amateur radio], or Tat (Tattoo), or Moonlight (to work a second job), or millions of more that I know you have heard. But some just don't. Those that don't can make sense if you look into their history. How about I list a few that don't make sense at first.
lb. - Yes, we all know that it means pound. So why is it lb. instead of pd. or pnd. or . . . well you get the idea, right?
Moon. - To show ones hind end. Then there must be a half moon for half assed people?
Boats. - Based on a true story.
OPPS - Zero Pixels Per Second.
Z - So why is "Z" a unit of sleep? Yes, I got my Zs last night.
NA - Not Available, is what first comes to mind but there are lots of other words that use the same abbreviation. A lot of abbreviations are like this and you have decide the meaning by the way it is used, or don't take the lazy way out and write it out in full.
And of course the ones that do make sense:
RV. - Most of us know that means Recreational Vehicle.
Ms. and Mrs. - Ms. is for Miss, an unmarried woman and Mrs. is for a married woman. (So does Mrs mean Mister's Sweetie?)
Cont. - Continued.
ASAP. - As soon as possible.
AA. - Alcoholics Anonymous
Alt. - Altitude
I could go on and on and on but you would surely get bored and bored and bored. So, I will let you all add some of your favorite abbreviations in your comments. So HAND (Have A Nice Day) you hear?