What would be an equivalent to Q.E.D in the jargon of Halacha literature? Usually in the Gemara we something like: קא משמע לן, however I can't think of a word that is used as Q.E.D.
Maybe הלמ״מ would be a good candidate or יצתה בת קול ואמרה?
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שמע מינה and קא משמע לן are used that way but both can also be used to introduce the conclusion rather than end the train of thought.
I haven't seen any research on this, but maybe דו"ק.
מאי קא משמע לן and קא משמע לן seem to fit the description provided in the Wikipedia link above.