When you're having a conversation and you need to spell a word letter by letter. How do you do it in your country? What's your version of the nato phonetic alphabet?
In Italy we use names of Italian cities, with the assumption that people know which letter they begin with.
Like:
N di Napoli
M di Milano
R di Roma
This goes for most letters.
It becomes creative with letters that aren't the initial of an Italian city, or not a big enough city that you're confident that the listener has ever heard of it. When no city comes to mind you start with very common words that begin with that letter.
K is pronounced "Kappa" so most people try with this at first, or it's Koala
Z is "Zeta", same, and it can be Zagabria or Zurigo. Or Zebra.
X is Xilofono because it's the only word you're confident that people will understand
H is universally Hotel
And so on.