From FreeCAD Documentation
Placement( ) or (Placement) or (Matrix) or (Base, Rotation) or (Base,Rotation,Center) or (Base,Axis,Angle)
Description: Constructs a placement, empty or with the given arguments, or as a copy of the given placement.
Base
Returns: a vector representing the Placement's position.
Rotation
Returns: a quaternion representing the Placement's rotation.
inverse( )
Description: computes the inverse placement
Returns: a placement.
move(Vector)
Description: moves the Placement along the given vector
Returns: nothing
multVec(Vector)
Description: applies the Placement to the given vector
Returns: the resulting vector.
multiply(Placement)
Description: multiplies this placement with another one
Returns: the resulting placement.
toMatrix( )
Description:
Returns: a matrix representing the Placement's transformation.