Epergnes are a type of table centerpiece that is usually made of silver but may be made of any metal or glass or porcelain.
They generally have a large central “bowl” or basket sitting on three to five feet. From this center “bowl” branches radiate supporting small baskets, dishes, or candleholders. There may be between two and seven branches. Epergnes were traditionally made from silver, however from around the start of the 20th century, glass was also employed. Reference: Wikipedia
Below are some examples and price guides of Art Nouveau epergnes including a silver epergne by Mappin & Webb and a French gilt metal and molded glass epergne.