The Ouija board is a flat board marked with the letters of the alphabet, the numbers 0–9, the words "yes", "no", "hello" (occasionally), and "goodbye", along with various symbols and graphics. It uses a small heart-shaped piece of wood or plastic called a planchette. Its commercial introduction was by businessman Elijah Bond in 1890. An employee of Bond, William Fuld, took over production in 1901 using the name "Ouija", later popularizing its name came from a combination of the French and German words for "yes". Ouija was regarded as a harmless parlor game unrelated to the occult until American Spiritualist Pearl Curran popularized its use as a divining tool during World War I. Mainstream religions and some occultists have associated use of the Ouija board with the threat of demonic possession and some have cautioned their followers not to use Ouija boards.