Two cones placed apex to apex. The double cone is given by algebraic equation
Double Cone
See also
Bicone, Cone, Cone Graph, NappeExplore with Wolfram|Alpha
References
Gellert, W.; Gottwald, S.; Hellwich, M.; Kästner, H.; and Künstner, H. (Eds.). VNR Concise Encyclopedia of Mathematics, 2nd ed. New York: Van Nostrand Reinhold, p. 193, 1989.Referenced on Wolfram|Alpha
Double ConeCite this as:
Weisstein, Eric W. "Double Cone." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/DoubleCone.html