טז וַיֵּצֵא קַיִן, מִלִּפְנֵי יְהוָה; וַיֵּשֶׁב בְּאֶרֶץ-נוֹד, קִדְמַת-עֵדֶן.
16 And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden.
Dalet is the door on the eastern side of the House, 4th letter as the corner of cube. This is known due to...