Running out of message space? Here's some short forms that might help.
Usage & Meaning
Not all of these short-hands can be assumed to be understood by the majorities of Internet or E-Mail users. However, there are some exceptions, which are fairly safe to use:
2
4
B
C
I
O
R
U
Y
to / too
for
be
see
eye
owe
are
you
why
The reason is that these abbreviations are based on the pronunciation of their corresponding letter / digit.