Crossing
131Crossing number (knot theory) — In the mathematical area of knot theory, the crossing number of a knot is the minimal number of crossings of any diagram of the knot. It is a knot invariant. By way of example, the unknot has crossing number zero, the trefoil knot three and the… …
132Crossing (architecture) — Cathedral floor plan (crossing is shaded) A crossing, in ecclesiastical architecture, is the junction of the four arms of a cruciform (cross shaped) church. In a typically oriented church (especially of Romanesque and Gothic styles), the crossing …
