A short series of prototype Soviet jet interceptor aircraft built by the Mikoyan-Gurevich aircraft bureau in 1959.  Although one of them, the Ye-152A, received the NATO reporting name [b]Flipper[/b] after appearing in a military airshow in 1961, no Ye-152 (nor any other member of the Ye-150 family) ever went into production.  Only one Ye-152A was ever built, and it was only used for testing.  It crashed in 1965.

"Wikipedia article on the Y-150 family":[https://en.wikipedia.org/wiki/Mikoyan-Gurevich_Ye-150_family]
ye-152 flipper