Word polygon each word. Further rules may be set. One letter may be highlighted, and all words made must include that letter. A minimum length for words may be set. There is always at least one word that can be made using all of the available letters, and the rules may require that a maximum length word be found. With each puzzle, a number of words to aim for is usually included as a guide, with three difficulty ratings: good, very good and excellent. Each puzzle differs in its target, depending on the letters given to work with. In Australia, "The Advertiser"
Three-letter acronym Three-letter acronym A three-letter acronym (TLA), or three-letter abbreviation, is an abbreviation, specifically an acronym, alphabetism, or initialism, consisting of three letters. These are usually the initial letters of the words of the phrase abbreviated, and are written in capital letters (upper case); three-letter abbreviations such as "etc." and "Mrs." are not three-letter acronyms, but "TLA" is a TLA (an example of an autological abbreviation). Most three-letter abbreviations are "initialisms": all the letters are pronounced as the names of letters, as in "APA" . Some are acronyms pronounced as a word; computed axial tomography, CAT, is almost always pronounced as