Copied from /g/

Hey /prog/ I asked /g/ this but they don't seem to know much about programming
Anyways
I'm learning the basics of C# and I'm wondering wtf this means:
byte[, ,][] localchunks = new byte[chunksizex / chunksize, chunksizey / chunksize, chunksizez / chunksize][];

Specifically the "byte[, ,]" and the "byte[chunksizex / chunksize, chunksizey / chunksize, chunksizez / chunksize]"

wtf is with the commas and forward slashes in the "[]" ??


         _________________________
        / _____________________  /|
       / / ___________________/ / |
      / / /| |               / /  |
     / / / | |              / / . |
    / / /| | |             / / /| |
   / / / | | |            / / / | |
  / / /  | | |           / / /| | |
 / /_/___| | |__________/ / / | | |
/________| | |___________/ /  | | |
| _______| | |__________ | |  | | |
| | |    | | |_________| | |__| | |
| | |    |_|/__________| | |____| |
| | |   / / ___________| | |_  / /
| | |  / / /           | | |/ / /
| | | / / /            | | | / /
| | |/ / /             | | |/ /
| | | / /              | | ' /
| | |/_/_______________| |  /
| |____________________| | /
|________________________|/