Nuujinn re is a single en space that is twice as wide as a word space a double space You raise the point that since Bringhurst does not talk about double spacing and instead uses en spacing which is a single character twice as wide as a word character he isn t to be considered in discussion about whether or not double spacing is obsolete Your position seems to run against that of Airborne84 who said Airborne84 talk I list reliable sources all but Butterick are listed in the Sentence spacing article at this time that either use the word obsolete or make statements that fit one of the accepted definitions of obsolete Robert Bringhurst In the nineteenth century which was a dark and inflationary age in typography and type design many compositors were encouraged to stuff extra spaces between sentences Generations of twentieth century typists were then taught to do the same by hitting the spacebar twice after every period Your typing as well as your typesetting will benefit from unlearning this quaint Victorian habit Are you saying that Airborne84 erred when he listed Bringhurst Otherwise please clarify your own statement Thanks RB