What it is
Three placement scalars combined into X, Y and Z. Placement Frame uses them for its heading and its offset.
Also accepts
These types plug into a Placement vector input and convert on their own:
Made by4
Used by4
Good to know
Fixed vectors
A Vector3 connects directly when the direction never changes. Plain numbers don't: build the vector with Combine Placement Vector.
Not normalized
Connecting a vector doesn't make it unit length. A heading only needs a direction; an offset is measured in blocks.