Symmetric ordering and Weyl realizations for quantum Minkowski spaces

Symmetric ordering and Weyl realizations for non-commutative quantum Minkowski spaces are reviewed. of Lie deformed corresponding star products, as well twist to realization coproduct momenta, presented. Drinfeld twists understood in Hopf algebroid sense also discussed. A few examples given. We show that the original Snyder space, there exists symmetric but no realization. Quadratic deformations space considered, it is demonstrated a generalized can be defined.