For the music group, see Blue Stone (music group). For the mineral, see Bluestone. For other uses, see Bluestone (disambiguation). Blue Stone (a Rainbow Code) or Unit 386D ENI was the electronic neutron initiator (generator) for the first British operational high-yield strategic nuclear weapon, Violet Club. References glossary of British nuclear weapons Violet Club vteCold War military projects of the United KingdomAir-to-air missiles Blue Sky (Fireflash) Blue Jay (Firestreak) Red Dean Red Top SRAAM Skyflash Flag of the United Kingdom Air-to-surface missiles Blue Steel Green Cheese Surface-to-air missiles CF.299 (Sea Dart) Green Light (Sea Cat) Red Duster (Bloodhound) Red Shoes (Thunderbird) Sea Slug Surface-to-surface missiles Blue Slug Blue Streak Blue Water Blue Rapier / Red Rapier Orange William (Swingfire) Satellite launch vehicles Black Arrow Black Knight Nuclear warheads Blue Danube Blue Peacock Orange Herald Red Beard Red Snow Violet Club Yellow Sun List of codenames used for projects (Rainbow Codes) This page uses Creative Commons Licensed content from Wikipedia (view authors).