Recently, Bob Moore posted:

"Neil Gould" wrote
Mathematically, an "angle" by itself *is* a scalar, and I'm not
arguing otherwise. I'm saying that "Angle Of Attack" requires
direction to have meaning. Without direction, there is no AOA.

Neil, give us an example of AOA having a "direction".

Well, OK. Then, how do you determine the AOA when the aircraft is
parked?

When parked with no wind, there is no relative wind and therefore NO
AOA.

Stated another way, AOA doesn't exist *without* a directional component.

Neil