Serial comma toast. Adding a serial comma removes this ambiguity. Writers who normally avoid the serial comma often use one in these circumstances, although sometimes re-ordering the elements of such a list can help as well. In some circumstances using the serial comma can create ambiguity. If the book dedication above is changed to the serial comma after "Ayn Rand" creates ambiguity about the writer's mother because it uses punctuation identical to that used for an appositive phrase, leaving it unclear whether this is a list of three entities (1, my mother; 2, Ayn Rand; and 3, God) or of only two
Punctuation of English the dot used as a thousands separator (though a thin space is sometimes used for the latter purpose, especially in technical writing, regardless what the decimal separator is). In computing, the dot is used as a delimiter more broadly, as site and file names ("wikipedia.org", "192.168.0.1." "document.txt"), and serves special functions in various programming and scripting languages. Guillemets sometimes called French quotation marks, are relatively uncommon in English, but are sometimes used as a form of quotation mark. The question mark is used to mark the end of a sentence which is a question. Quotation marks are used to mark