(quid videt; "which see") -- Means to go to or look up the description of the item immediately preceding. On this web site, sometimes we provide a link so if you click on the "q.v." the respective page or paragraph appears.
R-Y (approximately Pr for analog video or Cr for digital video or V for some applications including PAL)-- Video signal component consisting of the picture red content from which has been subtracted the overall luminance. The result represents the (approximate) red and cyan color content. See B-Y and also see Prime Disclaimer. There are slight normalizing (signal level proportioning) and optimizing differences between Cr and Pr and V we are not sure of.

This definition is in context to Television. See more contextual defintions for q.v..