Grimes explained the meaning of 'Exa Dark Sideræl', name of her and Tesla CEO Elon Musk's second child. Exa refers to supercomputing term exaFLOPS while Dark is "the unknown". "People fear it but truly it's...absence of photons," she said. Grimes further called Sideræl "a more elven" spelling of sidereal, "the true time of...universe, star time...not our relative earth time".