Lot's of "knowing" concepts connected with the Fourth Letter.
This is nicely exemplified by the opening verse of Genesis 4, corresponding to Dalet:
Genesis 4:1 And Adam knew (yada') Eve his wife; and she conceived, and bare (teled) Cain, and said, I have gotten a man from the LORD.
The word "bare" is spelled Tav Lamed Dalet, which is Dalet spelled backwards.
I chat about a lot of these connected ideas here.