Dr. Seuss wrote about this very question.

“You can stop, if you want, with the Z.
Because most people stop with the Z.
But not me!!!
In the places I go, there are things that I see
That I never could spell if I stopped with the Z.
I’m telling you this ‘cause you’re one of my friends.
My alphabet starts where your alphabet ends!”

“My alphabet starts with this letter called Yuzz.
It’s the letter I use to spell Yuzz-a-ma-Tuzz.
You’ll be sort of surprised what there is to be found
Once you go beyond Z and start poking around!

So, on beyond Z! It’s high time you were shown
That you really don’t know all there is to be known.”



https://en.wikipedia.org/wiki/On_Beyond_Zebra!

(One of my favorite Dr. Seuss books growing up)