Filigrana: The generic name for blown glass made with colorless, white and sometimes colored canes. The filigrana style originated at Murano in the 16th century and spread rapidly to other parts of Europe, where façon de Venise glass was produced. Manufacture at Murano continued until the 18th century, and was revived in the 20th century.
Note: Filigrana is called "reticello" when the threads form a grid (often with small air bubbles in the spaces between the threads). It is called "a retorti" or "retortoli" when threads twist in a spiral without crossing.
Source: Glass: A Pocket Dictionary of Terms Commonly Used to Describe Glass and Glassmaking compiled by David Whitehouse of The Corning Museum of Glass.
