Terran salute
From Memory Alpha, the free Star Trek reference.
The Terran salute is an often-required gesture of respect to fellow and superior officers (especially the captain) in the mirror universe. During the 2150s, it began with the right fist pressed against the left side of the chest, and then extended straight out parallel to the ground. However, by the time of the 2260s, the left arm was used, and the palm was opened as the arm was extended, giving it the appearance of a more traditional Nazi salute. It also resembles the salute used by the Roman Empire. The salute is occasionally accompanied with the phrase "Long live the Empire!". The salute ceased to be used when the Terran Empire fell.
