direct co-ordinate entry

[gld]

Would someone explain why they used U & V ??????????
My work space is labeled XYZ

 

[simonb65]

Would someone explain why they used U & V ??????????
My work space is labeled XYZ

Because it depends on which 3D plane (XY, ZX, ZY ) you are applying the 2D (U,V) co-ordinates on! They relate to different mapping co-ordinates.

See : 2D UV Mapping