The triangle spy plane people usually mean the rumored TR-3B or sometimes the Aurora/SR-91 Aurora idea. The TR-3B is the more common nickname in online UFO and “secret aircraft” talk, while the Aurora name shows up in reports about a rumored triangle-shaped spy plane from the 1990s.

What people usually mean

  • TR-3B Black Manta / Black Triangle : a popular alleged secret triangle aircraft in internet lore.
  • SR-91 Aurora : another rumored triangle-shaped hypersonic spy plane that some articles say may never have actually flown.

Important note

There is no confirmed public evidence that a real operational “triangle spy plane” exists under those names; a lot of the discussion comes from speculation, sightings, and UFO-style claims.

Plain-English answer

If you just want the name people most often use, it’s TR-3B Black Manta.