Lttrs.
It is a common abbreviation for 'Italian'. It's based on the first two letters of the word. The two letters are the beginning letters for the word in a number of languages. So the abbreviation works under a number of situations, in a number of different languages.
It's four letters, it needs no abbreviation. Write it.
I don't think it has an abbreviation because it is only two letters.
Lez
It's four letters, it needs no abbreviation. Write it.
BR
The Euro doesn't have an abbreviation (it is only 4 letters!), but it does have a symbol: '€'.
abbreviation
the abbreviation is D.H.L.
acronym
WHO is the abbreviation for the World Health Organization. It is an acronym, which is a term that is made from the first letters of a longer name.
I believe you are thinking of "abbreviation".