New issue of French typography journal "Cahiers GUTenberg" features an article by Charles Bigelow on historical and modern designs of O and zero, and their problems and principles. French translation with additional notes and appendices by Jacques André. Cover image by Kris Holmes of rotating-concentric zero uses all 18 new weights of Lucida Sans. (The cover date lags a couple of years behind the calendar; this issue is new). The English version was published as "Oh, oh, zero!" in TUGboat: The Communications of the TeX Users Group, Vol. 34, No. 2, pp. 168-181, 2013. French readers may be assured that the French version is superior to the English. Grâce à Jacques.
Below: characters resembling zero, Oh, and oh, from Lucida Sans and Lucida Grande fonts.