Gray balance
From The Glossary of Digital Photography
The mixture of primary colors to make a neutral gray color. Gray balance is used in CMY printing to generate a neutral gray from cyan, magenta, and yellow colored inks.

ONLINE GLOSSARY OF DIGITAL PHOTOGRAPY
The mixture of primary colors to make a neutral gray color. Gray balance is used in CMY printing to generate a neutral gray from cyan, magenta, and yellow colored inks.