When liberal publishers in some Western countries decide to green-light math titles by LGBT+ authors in spite of the high risk of offending or alienating conservative potential customers—when they argue that sexual orientation and math publication needn’t be mutually exclusive.
Radical Islamist groups from rogue nations like Saudi Arabia, Afghanistan, and Iran have warned foreign publishers that their publications would be removed from bookstores if they’re caught shipping rainbowmath titles to both Mohammedans and “infidels.”
Something that is flat but isn't, usually a cycling route or event, yet not stupidly hilly.
Coined by Audax Club Bristol members after their president Paul Rainbow referred to the 1200km long distance cycling event Paris-Brest-Paris as flat to ease any pre-event jitters; it wasn't!