David Crystal Quote

The most noticeable feature is the use of single letters, numerals, and symbols to represent words or parts of words, as with b "be" and 2 "to". They are called rebuses, and they go back centuries. Adults who condemn a "c u" in a young person's texting have forgotten that they once did the same thing themselves (though not on a mobile phone).

The Guardian (4 July 2008)