I noticed that PJMiller mentioned Ariel (with an e) whereas the typeface is Arial (with an a).
Seeing Ariel, I remembered that there was a Britannia class steam locomotive named Ariel.
https://en.wikipedia.org/wiki/List_of_BR_'Britannia'_Class_locomotives
I found it as number 70016.
From time to time I have wondered what is the origin of the name Arial (with an a) for the font.
I found the following theory, criticised yet recorded.
https://en.wikipedia.org/wiki/Talk:Arial#Penguin_Books.27_Ariel
There has been a practice of sometimes naming a font after the first printed book in which it, (or sometimes the original font upon which it is based), appeared.
For example, Centaur and Poliphilus.
https://en.wikipedia.org/wiki/Centaur_(typeface)
https://en.wikipedia.org/wiki/Hypnerotomachia_Poliphili
Returning to Ariel (with an e) and the theory from the Wikipedia talk page.
https://en.wikipedia.org/wiki/Penguin_Books
It appears that Ariel was the first Penguin book, reference 8 of https://en.wikipedia.org/wiki/Penguin_Books seems to imply this.
The book seems to be about the poet Percy Bysshe Shelley.
https://en.wikipedia.org/wiki/Percy_Bysshe_Shelley
One of various other uses of Ariel is the character in the Shakespeare play, The Tempest.
https://en.wikipedia.org/wiki/Ariel_(The_Tempest)
So I am wondering whether, even if the name Ariel were not used for the typeface that may have been Gill Sans, whether the fact that Ariel was the first Penguin book might be something to do with the origin of the name Arial.
Maybe the name Arial (with an a) was coined as a new word so that Intellectual Property Rights could be asserted?
I remember well Pelican books.
https://en.wikipedia.org/wiki/Penguin_Books#Pelican_Books
In particular a Pelican book that I have, Five Hundred Years of Printing by S.H. Steinberg, which I bought in the 1960s.
Mostly just musing, but hopefully of interest to some readers.
William