I almost always use upper case when I am using obvious acronyms, so it is WHO, NASA, NATO, AIDS, and so on. But I have noticed in reading news articles from some but not all sources that certain acronyms are written as if they are just nouns, as in the case of Nato and Nasa. For example, this article from the Guardian refers to the National Oceanic and Atmospheric Administration as Noaa and to the Virginia Institute of Marine Science as Vims. Similarly, this article from the BBC refers to Nasa. But the BBC, WHO, NFL, and the NBA are always kept as upper case.
[Read more…]