Overview
On Beyond Zebra! is a 1955 illustrated children's book by Theodor Geisel, better known as Dr. Seuss. In this take on the genre of alphabet book, Seuss presents, instead of the twenty-six letters of the conventional English alphabet, twenty additional letters that purportedly follow them.
Plot
The young narrator, not content with the confines of the ordinary alphabet, reports on additional letters beyond Z, with a fantastic creature corresponding to each new letter. For example, the letter "FLOOB" is the first letter in Floob-Boober-Bab-Boober-Bubs, which have large buoyant heads and float serenely in the water.
In order, the letters, followed by the creatures for which the letters are the first letter when spelling their names, are YUZZ (Yuzz-a-ma-Tuzz), WUM (Wumbus), UM (Umbus), HUMPF (Humpf-Humpf-a-Dumpfer), FUDDLE (Miss Fuddle-dee-Duddle), GLIKK (Glikker), NUH (Nutches), SNEE (Sneedle), QUAN (Quandary), THNAD (Thnadners), SPAZZ (Spazzim), FLOOB (Floob-Boober-Bab-Boober-Bubs), ZATZ (Zatz-it), JOGG (Jogg-oons), FLUNN (Flunnel), ITCH (Itch-a-pods), YEKK (Yekko), VROO (Vrooms), and HI! (High Gargel-orum).
The book ends with an unnamed letter that is substantially more complicated than those with names. A list of all the additional letters is shown at the end.
From Wikipedia (CC BY-SA 4.0).