Although they are descended from weapons used in actual combat, they are not normally used as such. Their form and, especially, their finishing and decoration are typically designed to show status and power and to be an impressive sight, rather than for practicality as a weapon. Quite often, ceremonial weapons are constructed with precious metals or other materials that make them too delicate for combat use. With ceremonial swords, an example of this is that the sword may be poorly balanced. Historically, however, many ceremonial weapons were also capable of actual combat, most notably in the military.
Maces, halberds, daggers and swords are the most common form of ceremonial weapons, but in theory almost any weapon can become ceremonial. The Sergeant at Arms in some parliaments carries a ceremonial mace. The Swiss Guard in the Vatican carry both ceremonial weapons (halberds and swords) and 21st century weapons (semi-automatic pistols). Mid 20th century rifles such as the American M14 and the Russian SKS, fitted with polished wood stocks, chrome plating and other decorative finishes, are common ceremonial weapons for honor guard units.
Media related to Ceremonial weapons at Wikimedia Commons