Ericsson RX8000 Series - Manual (Page 204)

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