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Should they have defined UI? Should they have defined DB? It is subjective where to draw the line for commonplace, and it depends on the audience.

Is DAG a commonplace acronym for people attending HYTRADBOI? Maybe (I see 2 other talks mentioning graphs/trees in their title).

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It costs nothing to use the full term once or twice. It can prevent confusion, and some people in the audience may not know the concept and googling a few letters is often not the best way to get useful results. Saving a couple syllables in a talk isn't worth it.

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