CookieMonster
Über Member
Its explained above by TastyReuben - whether or not they are capitalised depends on how they are pronounced.
In British English, if you say the letters separately eg. ISS, FBI, HMRC, CIA, AT&T then they are written all capitals. But if you make an actual word out the the abbreviation eg. Nasa, radar, laser, scuba, we don't generally capitalise them (grammatically this is called an acronym). Nasa is actually a bit of an unusual one because its both an acronym and a proper noun so it is always capitalised but is not written in full capitals.
I not sure who decided "nasa" is a proper noun.
not me, not anyone on the left side of the Atlantic.
why is "nasa" a proper noun and "fbi" is not a proper noun?
is "opec" a proper noun?