What name or part no of this plate 2x2 is?

[Zhengrong Zang]

As Philo mentioned, this isn't a LEGO piece.
But it was quite simple to create it.
I attached this part.

/Max

PS.: I never thought, that I would do a non LEGO Part here ;-)

Thank tou very much! Someday Lego might build this parts for SNOT

By the way, can you tell me the simple way to combine exist data to a new part dat file?