A beam of white light splitting into the three primary colours of red, green and blue on a transparent background.
Available from Redbubble with your choice of background colours.
White
https://www.redbubble.com/people/james-cole/works/108034826-white-beam-of-light-split-into-primary-rgb-coolers-on-white?asc=u
Black
https://www.redbubble.com/people/james-cole/works/108035173-white-beam-of-light-split-into-primary-rgb-coolers-on-black?asc=u