SMS language (also known as chatspeak, txt, txtspk, texting language or txt talk) is the English language slang used in mobile phone SMS. It is an abbreviated form of English known as a rebus. With predictive text input increasingly being used, it is becoming less common. This type of language has been alleged to not obey or follow standard English grammar; furthermore, the words used in this language can't be found in standard dictionaries. The invention of mobile phone messages may be considered as its source, although elliptical styles of writing dating back to at least the days of telegraphese. There are no standard rules for writing SMS languages. SMS is similar to AOL speak and Telex speak, and has evolved from the shorthand use in Internet chatrooms to accommodate the small number of characters allowed (early SMS permitted only 160 characters), and as a convenient lan