[npsomaratna]

But don't you need the normal vector to define the plane? (Genuine question)

[alok-g]

A bivector is just as good for the purpose. Think of it as a generalization of a directional arrow (vector) into an oriented area (bivector). The OP talk shows good visualizations if you haven't watched yet.

[npsomaratna]

Got it, thank you. (And facepalm, this is something I should have remembered!)

[tobinfricke]

A plane does not have a unique "normal vector" in higher than 3 dimensions.

[npsomaratna]

Good point, thank you.