It is a particular 2-dimensional subset of 3-dimensional space.
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xyz
That is a simply awful construction. Some revisions: This <fill in the blank> has been approved by XYZ. This <fill in the blank> has been authorized by XYZ. This <fill in the blank> has been issued under the authority of XYZ. This <fill in the blank> is issued and authorized by XYZ. Or perhaps you meant: Pending the approval of XYZ, this <fill in the blank> will be issued.
False
If you know the values, just multiply them. "xyz" refers to the product of x, y, and z.