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Entity realism (also selective realism), sometimes equated with referential realism, is a philosophical position within the debate about scientific realism. It is a variation of realism (independently proposed by Stanford School philosophers Nancy Cartwright and Ian Hacking in 1983) that restricts warranted belief to only certain entities.

The Aarne–Thompson–Uther Index (ATU Index) is a catalogue of folktale types used in folklore studies. The ATU Index is the product of a series of revisions and expansions by an international group of scholars: Originally composed in German by Finnish folklorist Antti Aarne (1910); the index was translated into English, revised, and expanded by American folklorist Stith Thompson (1928, 1961); and later further revised and expanded by German folklorist Hans-Jörg Uther (2004). The ATU Index, along with Thompson's Motif-Index of Folk-Literature (1932) (with which it is used in tandem) is an essential tool for folklorists.

A vacuum airship, also known as a vacuum balloon, is a hypothetical airship that is evacuated rather than filled with a lighter-than-air gas such as hydrogen or helium. First proposed by Italian Jesuit priest Francesco Lana de Terzi in 1670, the vacuum balloon would be the ultimate expression of lifting power per volume displaced.

Mass amateurization refers to the capabilities that new forms of media have given to non-professionals and the ways in which those non-professionals have applied those capabilities to solve problems (e.g. create and distribute content) that compete with the solutions offered by larger, professional institutions. Mass amateurization is most often associated with Web 2.0 technologies. These technologies include the rise of blogs and citizen journalism, photo and video-sharing services such as Flickr and YouTube, user-generated wikis like Wikipedia, and distributed accommodation services such as Airbnb. While the social web is not the only technology responsible for the rise of mass amateurization, Clay Shirky claims Web 2.0 has allowed amateurs to undertake increasingly complex tasks resulting in accomplishments that would seem daunting within the traditional institutional model.

In addition to whole websites and applications, Web 2.0 has also birthed a variety of digital tools that facilitate organization and problem solving on a large scale. These tools include tags, trackbacks, and hashtags. These new forms of media became widely available during the first decade of the 21st century due in part to the fall of transactional costs of creating and distributing media. Mass amateurization is a social, cumulative and collaborative activity, wherein ideas will flow back up the pipeline from consumers and they will share them among themselves.

There is no institutional hierarchy in mass amateurization. There is only an informal group of collaborators working to solve a problem. Due to mass amateurization, amateurs are able to collaborate without the interference from the inherent obstacles associated with institutions. These obstacles include the costs that an institution incurs while educating, training, directing, coaching, advising, and organizing its members.

The pirate game is a simple mathematical game. It is a multi-player version of the ultimatum game.

Improvised firearms (sometimes called zip guns or pipe guns) are firearms manufactured other than by a firearms manufacturer or a gunsmith, and are typically constructed by adapting existing materials to the purpose. They range in quality from crude weapons that are as much a danger to the user as the target to high-quality arms produced by cottage industries using salvaged and repurposed materials.

Improvised firearms are commonly used as tools by criminals and insurgents and are often associated with such groups; other uses include self-defense in lawless areas and hunting game in poor rural areas.

In statistics, Halton sequences are sequences used to generate points in space for numerical methods such as Monte Carlo simulations. Although these sequences are deterministic, they are of low discrepancy, that is, appear to be random for many purposes. They were first introduced in 1960 and are an example of a quasi-random number sequence. They generalize the one-dimensional van der Corput sequences.

A fleuron (;), also known as printers' flower, is a typographic element, or glyph, used either as a punctuation mark or as an ornament for typographic compositions. Fleurons are stylized forms of flowers or leaves; the term derives from the Old French: floron ("flower"). Robert Bringhurst in The Elements of Typographic Style calls the forms "horticultural dingbats". A commonly-encountered fleuron is the ❦, the floral heart or hedera (ivy leaf). It is also known as an aldus leaf (after Italian Renaissance printer Aldus Manutius).