Lauburu

The lauburu (from Basque lau, "four" + buru, "head") is an ancient hooked cross with four comma-shaped heads and the most widely known traditional symbol of the Basque Country and the Basque people. In the past, it has also been associated with the Galicians, Illyrians and Asturians.

A variant of lauburu consisting of geometrically curved lines can be constructed with a compass and straightedge, beginning with the formation of a square template; each head can be drawn from a neighboring vertex of this template with two compass settings, with one radius half the length of the other.