Another well written NHL Rule, Mamba Number 81.
For the purpose of this rule, the point of last contact with the puck
by the team in possession shall be used to determine whether icing
has occurred or not. As such, the team in possession must “gain the
line” in order for the icing to be nullified. “Gaining the line” shall mean
that the puck, while on the player’s stick (not the player’s skate) must
make contact with the center red line in order to nullify a potential
icing.