As a Z-person, I went on alphabetic alert when, in a New York Times Magazine interview (in print 9/17), Roz Chast mentioned a 2007 picture book by her and Steve Martin, The Alphabet from A to Y With Bonus Letter Z! (That’s Roz Chast the American cartoonist, and Steve Martin, the “American comedian, actor, writer, producer, and musician” (as his Wikipedia entry puts it):
Now: some very blurby words about the book. And then the two Z pages from it, Martin’s text on the right page, with ornaments by Chast; and Chast’s drawing on the left (illustrating the text, but throwing in many more words with Z in them). There are at least 28 words with Z in them mentioned on these two pages, plus one such word — zebra — that is, cleverly, evoked by drawings but not actually printed.
An ordinary alphabet book would end with Z is for Zebra; gigantically, that’s the standard choice for an exemplary Z-initial word*. This one ends with 5 drawings of zebras but not the word; you don’t need the word in print, because you get it as an automatic associate to the name or image of the letter.
[*note: very small sprinklings of the non-standard choices in these books: zeppelin, zipper, zodiac, zombie, zoo, zookeeper, AmE zucchini, a few others. Plus several stunningly non-standard choices like Zamboni (in A Hockey Alphabet) and ziti (in Food by Letter).]
That is, Chast and Martin chose — surely unknowingly — to exploit a massive mental association between the letter Z and the word zebra to evoke the letter entirely via drawings of zebras. That’s clever, and subtle.