  For the three family quark flavor mixing, the best parametrization is the
original Kobayashi-Maskawa matrix, $V_{KM}$, with four real parameters: three
rotation angles $\theta_{1,2,3}$ and one phase $\delta$. A popular way of
presentation is by the unitarity triangle which, however, explicitly displays
only three, not four, independent parameters. Here we propose an alternative
presentation which displays simultaneously all four parameters: the unitarity
boomerang.
