The name version is a great name but shortening it to just the letter V is greatest. You got some V In your wallet? V accepted here. Doesn't get any shorter.. Works like a £ or $ sign. Easiest to remember, looks awesome as a letter in it's self. My vote is for V.
That's an interesting suggestion to change the name from Version to V, but the symbol is already V and you can still say V accepted here. If you think that it's difficult to market Version, just imagine trying to market a single letter of the alphabet. I did a quick search, and there is no coin with just a letter as its name. I found a few such as Joincoin (J) and Revain (R), but although they may have a single letter representing them, they still are backed by a name and I believe that having an actual name of Version with the letter V as the symbol should remain as it is.