TKD p. 57. SuH, Su' and 'eH all mean that the speaker is about to give a command. They are comparable to the "Ready!" at the beginning of a race: "Ready! Set! Go!" SuH and Su', but not 'eH, can also be used to indicate that the speaker is ready to do something or that arrangements have been made for something to happen. Some speakers of Klingon pronounce SuH as if it were SSS, almost like the English expression for "be quiet": 'shhh!'