A cross is a geometrical figure consisting of two lines or bars perpendicular to each other, dividing one or two of the lines in half. The lines usually run vertically and horizontally; if they run diagonally, the design is technically termed a saltire.

The cross is one of the most ancient human symbols, and is used by many religions, most notably Christianity. It is frequently a representation of the division of the world into four elements[citation needed] (or cardinal points), or alternately as the union of the concepts of divinity, the vertical line, and the world, the horizontal line (Koch, 1955).