Placard in the context of Signage

Proletarian internationalism, sometimes referred to as international socialism, is the perception of all proletarian revolutions as being part of a single global class struggle rather than separate localized events. It is based on the theory that capitalism is a world-system and therefore the working classes of all nations must act in concert if they are to replace it with communism.

Proletarian internationalism was strongly embraced by the first communist party, the Communist League, as exercised through its slogan "Proletarians of all countries, unite!", later popularized as "Workers of the world, unite!" in English literature. This notion was also embraced by the Bolshevik Party. After the formation of the Soviet Union, Marxist proponents of internationalism suggested that country could be used as a "homeland of communism" from which revolution could be spread around the globe. Though world revolution continued to figure prominently in Soviet rhetoric for decades, it no longer superseded domestic concerns on the government's agenda, especially after the ascension of Joseph Stalin, who was a proponent of socialism in one country. Despite this, the Soviet Union continued to foster international ties with communist and left-wing parties and governments around the world. It played a fundamental role in the establishment of several socialist states in Eastern Europe after World War II and backed the creation of others in Asia, Latin America, and Africa. The Soviets also funded dozens of insurgencies being waged against colonialist governments by leftist guerrilla movements worldwide. A few other states later exercised their own commitments to the cause of world revolution. Cuba frequently dispatched internationalist military missions abroad to defend communist interests in Africa and the Caribbean.

A hopper car (NAm) or hopper wagon (UIC) is a type of railroad freight car that has opening doors or gates on the underside or on the sides to discharge its cargo. They are used to transport loose solid bulk commodities such as coal, ore, grain, and track ballast. Plastic pellets and some finely ground material, similar to flour, are transported in hopper cars that have pneumatic unloading. The bottom gates on the pneumatic hoppers connect to a hose attached to industrial facilities' storage tanks. Air is injected to fluidize the railcar contents for unloading. The hopper car was developed in parallel with the development of automated handling of such commodities, including automated loading and unloading facilities.

Hopper cars are distinguished from gondola cars, which do not have opening doors on their underside or sides. Gondola cars are simpler and more compact because sloping ends are not required, but a rotary car dumper is required to unload them. Some "dual-purpose" hoppers have a rotary coupler on one or both ends, so they can be used in both rotary and bottom-dump operations.

The Pierides Museum is a museum in Larnaca, Cyprus that was founded by the Pierides Foundation. It is the nation's oldest private museum.

The placard on the museum building says (as of 2013) "Perides Museum - Bank of Cyprus Cultural Foundation". The collection was initiated by Demetrios Pierides, in the 19th century (1811 - 1895), with the aim of protecting and preserving Cyprus' antiquities and preventing the loss of the island's history.

A UN number (United Nations number) is a four-digit number that identifies hazardous materials, and articles (such as explosives, flammable liquids, oxidizers, toxic liquids, etc.) in the framework of international trade and transport. Some hazardous substances have their own UN numbers (e.g. acrylamide has UN 2074), while sometimes groups of chemicals or products with similar properties receive a common UN number (e.g. flammable liquids, not otherwise specified, have UN 1993). A chemical in its solid state may receive a different UN number than the liquid phase if its hazardous properties differ significantly; substances with different levels of purity (or concentration in solution) may also receive different UN number