Ericsson RX8000 Series Reference Manual page 204

Annex A
Y (Luminance)
Y/C
YUV
A-20
Defines the brightness of a particular point on a TV line. The only
signal required for black and white pictures.
Broadcast video with separate colour, Y (luminance) and C
(Chroma) (sometimes called S-Video).
Y: Luminance component (Brightness), U and V: Chrominance
(Colour difference)
EN/LZT 790 0005 R1A