In Paleo Hebrew Dü was drawn as a Door. Door shows up throughout the books of (4) Numbers, (26) Psalms and (48) Second John. By studying Door in these books all of Dü's meanings can be learned.
Dü is:
When prefixed to a word Dü is the preposition "who" or "whom." The way Dü is drawn it's a picture of someone's face next to an open door or door frame. The question with all doors is who is on the other side?
Jesus is the Door.
40 John 10:7-10
7Jesus said to them again, Truly, truly, I say to you, I am the door of the sheep.
8All who have come are thieves and bandits, if the sheep did not hear them.
9I am the door; if any man enter by me, he will live and he will come in and go out and find pasture.
10A thief does not come, except to steal and kill and destroy; I have come that they might have life, and have it abundantly.
Jesus is the door.