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Module 

Header 
/Engine/Source/Runtime/Core/Public/Math/TransformNonVectorized.h 
Include 
#include "Math/TransformNonVectorized.h" 
TTransform< T > operator*
(
const TQuat< T > & Other
) const
Return a transform that is the result of this multiplied by another transform (made only from a rotation). Order matters when composing transforms : C = A * B will yield a transform C that logically first applies A then B to any subsequent transformation.
new transform: this * TTransform(Other)
Parameter 
Description 

Other 
other quaternion rotation by which to multiply. 