The Wikipedia Logo Colors with Hex & RGB Codes has 5 colors which are Black (#000000), Granite Gray (#636466), Spanish Gray (#939598), Chinese Silver (#C7C8CA) and White (#FFFFFF).
This color combination was created by user Keshav Naidu. The Hex, RGB and CMYK codes are in the table below.
Note: English language names are approximate equivalents of the hexadecimal color codes.
Wikipedia uses black and white in their logo and brand with three shades of gray.