Tracery is the ornamental intersecting work in the upper part of a window, screen, or panel, or used decoratively in blank arches and vaults. The earliest use of the term is traced to the seventeenth century.
Gothic Capitals John Ruskin c. Engraving Source: Works, facing XI, One of Ruskin's many technical illustrations for The Stones of Venice — the architectural equivalent of the geological studies in Modern Painters
I love this picture cause you can see the differences between the two gargoyles, the top is decorative, not hunched over, the bottom one is definitely a water spout due to its posture. this shows great levels of the different decorations.