The Door is a transversal and transdimensional door. It has no real name, so we just call it 'The Door'. It is also a huge door. About 18298301830918309128342 LY across. The Door has a door handle, not a doorknob. Also, there seems to be writing on it. If you use a powerful enough telescope and zoom out to see the full Door, the writing will read
0110100001101111011101110010000001110100011011. It appears to be Binary.
The door is also made of some TREEYUM/wood mixture. If you open the door and go through it, you will end up in a different reality with different time, different dimensions, and a different location. The door has not been found to transport the user to negative size verse or dimensions or to Class 7 verses and above.
edit: JTOHNK translated the binary. It means: