If you want to though, you can create a custom list with up to 5 letters in the name, and store your number(s) in that.
So you could do:

5->⸤APPLE(1

The (1 is important because it specifies what index of the list to store your number at. Also, because it's the first index, the calculator will automatically create the list for you, if it doesn't already exist.

Hope this helps!

But do note that this takes up more space, and if you're only using the list for one value, your program will look cleaner if you just use a normal single letter variable instead.