This forum’s administrators just wasted over 10 minutes of my time with asking question without specifying it enough.
“What does E in ENTJ stand for?”
E in abbrevation ENTJ stands for EXTRAVERTED or it can at least mean that too. It does not stand for “extrovert” according classic mbti naming system. What might bring confusion here is the “Logical Intuitive Extrovert” term, but I think this is only socionics term. If anobody now comes to this forum having read only classical MBTI or using that as his primary thinking tool, then you confirmation question will make him very confused, as it does not accept “extraversion”, which really should be at least one accepted option.