It’s a UNESCO. For example, we say a UNESCO World Heritage Site, a UNESCO project, a UNESCO study, etc. Since the word UNESCO begins with a consonant sound ("you"), we use the article a.
The reef has been listed a UNESCO World Heritage Site.
The reef has been listed an UNESCO World Heritage Site.
The abbreviation UNESCO begins with a vowel, but it doesn't have a vowel sound.
He is a UNESCO expert who left the US and went to Africa in 2020.
And remember, the rule for using "a" or "an" is based on pronunciation, not spelling.
According to a UNESCO report, sustainability should become a core practice and purpose of higher education institutions.
Similarly, when referring to the letter "U", we say "a U" (not an "U").
I'd like to buy a necklace with a "U" on it.
A partial list of abbreviations that also begin with the consonant sound "you", and therefore take "a", can be found below: