Question mark
In the early 13th century, when the growth of communities of scholars (universities) in Paris and other major cities led to an expansion and streamlining of the book-production trade, punctuation was rationalized by assigning Alcuin's stroke-over-dot specifically to interrogatives; by this time the stroke was more sharply curved and can easily be recognized as the modern question mark.
Cadit quaestio
As a mark in copy editing, "cq" implies that the accuracy of a statement, fact, etc., has been verified. It is usually placed in a draft article by the writer, to the attention of the copy editor. The precise origin of the term is uncertain, but 'cq' was identified as the shorthand form of "correct" in the 1879 Phillips Code, a set of abbreviations used in the transmission of press reports via telegraph, first published in 1879. Alternate explanations of the origin include an abbreviation for "cadit quaestio", indicating that the issue is "no longer in question", and an abbreviation for "correct as quoted", which serves as a useful mnemonic. "Cq" is a mark for internal use only, intended for removal prior to publishing. It should be distinguished from the unrelated mark "sic", used in published pieces to indicate that a quote has been transcribed verbatim, without correcting perceived errors in the original source.