" ? " means Question mark

According to a 2011 discovery by a Cambridge manuscript expert, Syriac was the first language to use a question mark in the form of a vertical double dot. Lynne Truss attributes an early form of the question mark to Alcuin of York.Truss describes the punctus interrogativus of the late 8th century as "a lightning flash, striking from right to left".(The punctuation system of Aelius Donatus, current through the Early Middle Ages, used only simple dots at various heights.)

This earliest question mark was a decoration of one of these dots, with the "lightning flash" perhaps meant to denote intonation (or a tilde or titlo, named after the Latin word titulus, as in ~ , like those wavy and more or less slanted marks used in lots of medieval texts for denoting various things such as abbreviations, and that would become later various diacritics or ligatures or modified letters used in the Latin script), and perhaps associated with early musical notation like neu ...more

Symbol of query.