Just saying ‘ISBN’ creates an instant bond with any fellow book trade devotees in the vicinity. Whether you favour the spell out (i.s.B.n., generally with an element of slur) or the phonetic slide (IsBin), publishers, booksellers and librarians alike perk up their ears at the mention of this secret password, this shared standard, this format filer.
When does a helping hand, like the ISBN has been for the printed book, become a major pain in the behind?