[Narretz]

I thought UAP stands for "unidentified aerial/aerospace phenomenon". Anyway it's better than UFO because it primes you for the fact that many "UFOs" are not flying at all. Many are stars, lights of all kinds, or artifacts of the the recording equipment.

[DoreenMichele]

I thought so too. I googled it and came up with the above quote but didn't provide the link.

Happy to be corrected if someone has a good source they can cite.

It is a better term overall and also lacks the baggage of being used colloquially to mean "aliens."