The word "bead" comes from the Anglo-Saxon words "bidden" (to pray) and "bede" (prayer). The vast majority of early Anglo-Saxon female graves contain beads, which are often found in large numbers in the area of the neck and chest. Beads are sometimes found in male burials, with large beads often associated with prestigious weapons. A variety of materials other than glass were available for Anglo-Saxon beads, including amber, rock crystal, amethyst, bone, shells, coral and even metal. These beads are usually considered to have a social or ritual function. Anglo-Saxon glass beads show a wide variety of bead manufacturing techniques, sizes, shapes, colours and decorations. Various studies have been carried out investigating the distribution and chronological change of bead types. The crystal beads which appear on bead strings in the pagan Anglo-Saxon period seems to have gone through various changes in meaning in the Christian period, which Gale Owen-Crocker suggests was linked to symbolism of the Virgin Mary, and hence to intercession. John Hines has suggested that the over 2,000 different types of beads found at Lakenheath show that the beads symbolise identity, roles, status and micro cultures within the tribal landscape of the early Anglo-Saxon world.