Xerox DocuColor 2045 Color Management Manual page 56

Glossary Of Color Management Terms
TRC
Uncoated
XYZ
B-4
Tone Reproduction Curve. TRCs may be created and stored by
users who wish to achieve certain effects on a consistent basis.
User TRCs can be applied to all jobs, including those that
originate as Reprint files.
Uncoated defines whether a stock has been coated or was left
uncoated. Generally, prints on uncoated stock will appear flatter
than do prints on coated stocks.
A color space which maps to human eye response. The DocuSP
controller utilizes XYZ as its Profile Connection Space (PCS).
Color Management Guide