What does UAP stand for? Today the US government uses it for Unidentified Anomalous Phenomena: sightings in the air, in space, on the sea or under water that observers cannot identify right away. An older version of the same letters, still common in news stories, is Unidentified Aerial Phenomena.
UAP is the official replacement for the familiar word UFO. The point of the change was to sound less like science fiction and to cover more than flying objects. A strange radar return, a blur on a camera or a light over the ocean can all be logged as a UAP while people work out what it really was.
Quick facts
Stands for
Unidentified Anomalous PhenomenaOlder form
Unidentified Aerial PhenomenaType
Initialism, said U A PSingular or plural
Both, depending on the sentenceUsed in
Government reports, military briefings, newsOlder word
UFO, unidentified flying objectDoes not mean
Proof of visitors from another planet
What does UAP stand for, word by word?
In short, UAP stands for three plain words that each limit the claim:
- U, Unidentified: nobody has confirmed what the thing is yet.
- A, Anomalous: it does not match what observers expected to see. In the older form, A stood for Aerial, meaning in the air.
- P, Phenomena: things that are seen or recorded. The singular is phenomenon, though people often say "a UAP" for one event.
The switch from aerial to anomalous widened the term. Lawmakers and defense officials wanted one label for reports from the sky, from orbit and from below the waves, so anomalous replaced aerial in official use. Many reporters and readers still use both versions, and they point to the same idea.
Why the government stopped saying UFO
UFO, short for unidentified flying object, picked up decades of pop culture baggage. Saying it in a briefing could make a pilot sound like they were talking about aliens. UAP is meant as a neutral, technical word that lets crews report odd events without that stigma. It also avoids the word object, since some reports may turn out to be weather, light effects or sensor glitches rather than solid things.
Our UFO page covers the older term and how it has been used. Both terms describe the same starting point: something not yet explained.
Who studies UAP reports?
Inside the Department of Defense, an office called the All-domain Anomaly Resolution Office, or AARO, collects and reviews UAP reports from the military and other agencies. NASA has also looked at how better science and data could help explain them. Reviews so far have found that many cases turn out to be ordinary things, such as balloons, drones, birds, satellites or camera effects, while others lack enough data to settle.
A news headline: "Navy pilots file new UAP reports." This means the pilots logged sightings they could not identify at the time. It does not mean anyone has found something from outer space.
How to use UAP in a sentence
The letters are said one by one, "U A P," and written in capitals. Since the name opens with a "you" sound, write a UAP, never an UAP.
- "The crew filed a UAP report after the flight."
- "Most UAP cases are later explained."
- "The hearing focused on UAP and air safety."
- "Several UAPs were recorded near the training area."
Some writers avoid adding an s, since phenomena is already plural. Both styles appear in print. Want more about initialisms? See acronym vs abbreviation.
What is UAP stand for outside of sightings?
In nearly every search, people mean the sightings term. You may also see the letters used as the initials of a school, a group or a product, but those uses are local and small. When an older article says Unidentified Aerial Phenomena and a newer one says Unidentified Anomalous Phenomena, both are talking about the same kind of report, only with different wording from different years of policy.
If the story mentions pilots, radar or the sky, it is the sightings meaning. For more defense and agency letters, visit the government acronyms hub.
Questions people ask
Is a UAP the same as a UFO?
They describe the same idea, something seen but not yet identified. UAP is the newer, official term and is broader, since it covers events in space and under water too.
Does UAP mean aliens?
No. The word only says that something has not been explained yet. Most reviewed cases turn out to have ordinary causes, and the rest usually lack enough data.
What does the A in UAP stand for?
Today it stands for anomalous. Earlier government documents and many news stories used aerial, and you will still see both.
How do you say UAP?
Say each letter: U A P. Nobody pronounces it as one word.
Why did the name change from aerial to anomalous?
Officials wanted one term that covered reports from the air, from space and from the sea. Anomalous fits all three, while aerial only covers the sky.