What you’ve written above are short forms used in text messages. People do this in other languages also. For example in Italian the word “che”[which, that ] sounds like the letter k. So sometimes they just the letter.

Alpa, Bravo, Delta etc is used if you are spelling something over the telephone and want to be sure the person gets the letters correct…

so three different things-

Those who can’t spell that well would do well to learn rather than using r u etc http://en.wikipedia.org/wiki/Newspeak

Alpha = a

Bravo = b

Charlie =c

Zulu = z

etc etc

R for are is just an easier way to write things fast…

I would like to know the complete alphabet, and I don’t mean the military, phonetic alphabet….. b4 u go!, cu later!, uraqt,

yru, Idgaf, urns,