Signet ring in the context of "Perdiccas"

Minoan seals are impression seals in the form of carved gemstones and similar pieces in metal, ivory and other materials produced in the Minoan civilization. They are an important part of Minoan art, and have been found in quantity at specific sites, for example in Knossos, Malia and Phaistos. They were evidently used as a means of identifying documents and objects.

Minoan seals are of a small size, 'pocket-size', in the manner of a personal amulet. Many of the images are a similar size to a human fingernail, with a high proportion that of the nail of a little finger. They might be thought of as equivalent to the pocket-sized, 1 inch (3 cm) scaraboid seals of Ancient Egypt, which were sometimes imitated in Crete. However Minoan seals can be larger, with largest examples of many inches.

Hardstone carving, in art history and archaeology, is the artistic carving of semi-precious stones (and sometimes gemstones), such as jade, rock crystal (clear quartz), agate, onyx, jasper, serpentinite, or carnelian, and for objects made in this way. Normally the objects are small, and the category overlaps with both jewellery and sculpture. Hardstone carving is sometimes referred to by the Italian term pietre dure; however, pietra dura (with an "a") is the common term used for stone inlay work, which causes some confusion.

From the Neolithic period until about the 19th century such objects were among the most highly prized in a wide variety of cultures, often attributed special powers or religious significance, but today coverage in non-specialist art history tends to be relegated to a catch-all decorative arts or "minor arts" category. The types of objects carved have included those with ritual or religious purposes, engraved gems as signet rings and other kinds of seal, handles, belt hooks and similar items, vessels and purely decorative objects.

The Archbishop of Glasgow is an archiepiscopal title that takes its name after the city of Glasgow in Scotland. The position and title were abolished by the Church of Scotland in 1689; and, in the Catholic Church, the title was restored by Pope Leo XIII in 1878. In the Scottish Episcopal Church, it is now part of the Episcopal bishopric of Glasgow and Galloway.

The present Catholic archbishop is William Nolan, who was installed on 26 February 2022.

A signaculum is a general Latin term for a seal or sign produced by a stamp or signet ring, used in modern scholarship in particular reference to Roman lead pipe inscriptions, brick stamps, bread stamps, and the lead "dog tag" of Roman soldiers.