What band has a logo with a triangle prism with grey on one side and rainbow on the other?

That is Pink Floyd's iconic artwork for their album "Dark Side of the Moon." It was designed by Hipgnosis and George Hardie, and it represents society. The white light represents unity, which passes through the prism (representing society), and comes out the other side as an absence of unity. The album artwork is widely recognized around the world since "Dark Side of the Moon" is one of the most successful rock albums in history.