[FEN "2r1r1k1/5ppp/8/8/Q7/8/5PPP/4R1K1 w - - 0 1"]
The important square of e8 square is hanging. It is hanging because if white can take that square it's checkmate. Is this a hanging square tactic?
If the rook on Rook on c8 is deflected from the protection of e8, is it called a deflection tactic?
[FEN "6k1/3qb1pp/4p3/ppp1P3/8/2PP1Q2/PP4PP/5RK1 w - - 0 1"]
Here, the important f8 square is not hanging, so white plays Qf7+ to deflect the king from protection of f8 square, thus leading to checkmate.