It is a graphic sign to surround text, there is an opening sign and a closing sign, although in many fonts the same layout is used ( ' ' ). As they come from even, it is more customary to name them in plural. It is used to highlight an appointment, a parliament or title, but with a feature, having double quotation mark and double angular quotation mark the single quotation mark is an alternative to nest quotation text quoted within other quoted text. See apostrophe .
