Likutei Moharan 34:5/ליקוטי מוהר"ן ל״ד:ה׳

15. The m’loopum —i.e., the aspect of “Yosef was the ruler”—is a point with a vav. This is because the aspect of Yosef is drawn from Chokhmah and Binah, as is written (Genesis 41:39), “Now that [God] has made all this known to you, there is none so understanding and wise as you”—that is Wisdom and Understanding. And the result of this was that “Yosef was the ruler.”

2And Chokhmah corresponds to a nekudah, a yod, the fountain. Binah is the brook that is drawn from the fountain. On account of this drawing [Binah] is a vav.