Is this gesture only reserved for the discommendation ceremony (TNG: “Sins of the Father”), and subsequent reminders of the status (TNG: “Reunion”)?
Have we seen Klingons use that gesture under any other circumstances?
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In the canon thus far at this writing, the gesture has only been used in relation to discommendation. Given how seriously being discommended is taken in Klingon culture, it seems unlikely that the gesture would be used casually or in a way that would be confused with its discommendation-related meaning.