Abstraction in its main sense is a conceptual process where general rules and concepts are derived from the usage and classification of specific examples, literal ("real" or "concrete") signifiers, first principles, or other methods. "An abstraction" is the outcome of this process—a concept that acts as a common noun for all subordinate concepts, and connects any related concepts as a group, field, or category.Conceptual abstractions may be formed by filtering the information content of a concept or an observable phenomenon, selecting only the aspects which are relevant for a particular subjectively valued purpose. For example, abstracting a leather soccer ball to the more general idea of a ball selects only the information on general ball attributes and behavior, excluding, but not eliminating, the other phenomenal and cognitive characteristics of that particular ball. In a type–token distinction, a type (e.g., a 'ball') is more abstract than its tokens (e.g., 'that leather soccer ball'). Abstraction in its secondary use is a material process, discussed in the themes below.

The Central Product Classification (CPC) is a product classification for goods and services promulgated by the United Nations Statistical Commission. It is intended to be an international standard for organizing and analyzing data on industrial production, national accounts, trade, prices and so on. The European Union's Classification of Products by Activity (CPA) is based on CPC.

The Classification of types of construction (CC), is a nomenclature for the classification of constructions (i.e. buildings) according to their type. It is based on the CPC that was published by the United Nations in 1991. Its final version was approved in 1997. The decimal system classification - each type is qualified by a four-digit number - comprises: 2 Sections (1-digit) - Buildings, Civil engineering works 6 Divisions (2-digit) 20 Groups (3-digit) 46 Classes (4-digit) The CC is a "standard that must be taken into account in recording, collecting, processing, analysing, transmitting and disseminating data on construction works for statistical and record-keeping purposes" in various European countries and Eurostat.

Council Regulation (EEC) No 2658/87 of 23 July 1987, creates the goods nomenclature called the Combined Nomenclature, or in abbreviated form 'CN', established to meet, at one and the same time, the requirements both of the Common Customs Tariff and of the external trade statistics of the European Union. The codes and the descriptions of goods established on the basis of the combined nomenclature shall replace those established on the basis of the nomenclatures of the Common Customs Tariff and the Nimexe. It is established on the basis of the Harmonized System. The combined nomenclature shall comprise : (a) the harmonized system nomenclature; (b) Community subdivisions to that nomenclature, referred to as 'CN subheadings' in those cases where a corresponding rate of duty is specified; (c) preliminary provisions, additional section or chapter notes and footnotes relating to CN subheadings. Each CN subheading shall have an eight digit code number : (a) the first six digits shall be the code numbers relating to the headings and subheadings of the harmonized system nomenclature; (b) the seventh and eighth digits shall identify the CN subheadings The Commission established an integrated tariff, of the European Communities, referred to as the 'TARIC code', based on the combined nomenclature. The combined nomenclature, together with the rates of duty and other relevant charges, and the tariff measures included in the Taric or in other Community arrangements shall constitute the common customs tariff referred to in Article 9 of the Treaty, which shall be applied on the importation of goods into the Community Member States may insert subdivisions after the CN subheadings for national statistical purposes, and after the Taric subheadings for other national purposes. The Commission shall be assisted by a Committee on Tariff and Statistical Nomenclature, called the 'Nomenclature Committee'. 'Favourable tariff arrangement' means any reduction or suspension, even under a tariff quota, of a customs duty or charge having equivalent effect or of an agricultural levy or other import charge provided for under the common agricultural policy or under the specific arrangements applicable to certain goods resulting form the processing of agricultural products. Commission shall adopt each year by means of a Regulation a complete version of the combined nomenclature together with the corresponding autonomous and conventional rates of duty of the Common Customs Tariff, as it results from measures adopted by the Council or by the Commission. said Regulation shall be published not later than 31 October in the Official Journal of the European Communities and it shall apply from 1 January of the following year.

A common external tariff must be introduced when a group of countries forms a customs union. The same customs duties, import quotas, preferences or other non-tariff barriers to trade apply to all goods entering the area, regardless of which country within the area they are entering. It is designed to end re-exportation; but it may also inhibit imports from countries outside the customs union and thereby diminish consumer choice and support protectionism of industries based within the customs union. The common external tariff is a mild form of economic union but may lead to further types of economic integration. In addition to having the same customs duties, the countries may have other common trade policies, such as having the same quotas, preferences or other non-tariff trade regulations apply to all goods entering the area, regardless of which country, within the area, they are entering. Important examples of common external tariff are that of the Mercosur countries (Brazil, Argentina, Venezuela, Paraguay and Uruguay), the Common Customs Tariff of the Eurasian Economic Community customs union as well as the European Union Customs Union.

Concepts are defined as abstract ideas or general notions that occur in the mind, in speech, or in thought. They are understood to be the fundamental building blocks of thoughts and beliefs. They play an important role in all aspects of cognition. As such, concepts are studied by several disciplines, such as linguistics, psychology, and philosophy, and these disciplines are interested in the logical and psychological structure of concepts, and how they are put together to form thoughts and sentences. The study of concepts has served as an important flagship of an emerging interdisciplinary approach called cognitive science.In contemporary philosophy, there are at least three prevailing ways to understand what a concept is: Concepts as mental representations, where concepts are entities that exist in the mind (mental objects) Concepts as abilities, where concepts are abilities peculiar to cognitive agents (mental states) Concepts as Fregean senses (see sense and reference), where concepts are abstract objects, as opposed to mental objects and mental statesConcepts can be organized into a hierarchy, higher levels of which are termed "superordinate" and lower levels termed "subordinate". Additionally, there is the "basic" or "middle" level at which people will most readily categorize a concept. For example, a basic-level concept would be "chair", with its superordinate, "furniture", and its subordinate, "easy chair". A concept is instantiated (reified) by all of its actual or potential instances, whether these are things in the real world or other ideas. Concepts are studied as components of human cognition in the cognitive science disciplines of linguistics, psychology and, philosophy, where an ongoing debate asks whether all cognition must occur through concepts. Concepts are used as formal tools or models in mathematics, computer science, databases and artificial intelligence where they are sometimes called classes, schema or categories. In informal use the word concept often just means any idea.

Cyberspace is an individual as well as international concept. It is a widespread, interconnected digital technology. The term entered the popular culture from science fiction and the arts but is now used by technology strategists, security professionals, government, military and industry leaders and entrepreneurs to describe the domain of the global technology environment. Others consider cyberspace to be just a notional environment in which communication over computer networks occurs. The word became popular in the 1990s when the uses of the Internet, networking, and digital communication were all growing dramatically and the term "cyberspace" was able to represent the many new ideas and phenomena that were emerging.The parent term of cyberspace is "cybernetic", derived from the Ancient Greek κυβερνήτης (kybernētēs, steersman, governor, pilot, or rudder), a word introduced by Norbert Wiener for his pioneering work in electronic communication and control science. This word cyberspace first appeared in the art installation of the same name by danish artist Susanne Ussing, 1968).As a social experience, individuals can interact, exchange ideas, share information, provide social support, conduct business, direct actions, create artistic media, play games, engage in political discussion, and so on, using this global network. They are sometimes referred to as cybernauts. The term cyberspace has become a conventional means to describe anything associated with the Internet and the diverse Internet culture. The United States government recognizes the interconnected information technology and the interdependent network of information technology infrastructures operating across this medium as part of the US national critical infrastructure. Amongst individuals on cyberspace, there is believed to be a code of shared rules and ethics mutually beneficial for all to follow, referred to as cyberethics. Many view the right to privacy as most important to a functional code of cyberethics. Such moral responsibilities go hand in hand when working online with global networks, specifically, when opinions are involved with online social experiences.According to Chip Morningstar and F. Randall Farmer, cyberspace is defined more by the social interactions involved rather than its technical implementation. In their view, the computational medium in cyberspace is an augmentation of the communication channel between real people; the core characteristic of cyberspace is that it offers an environment that consists of many participants with the ability to affect and influence each other. They derive this concept from the observation that people seek richness, complexity, and depth within a virtual world.

Engineering is the application of knowledge in the form of science, mathematics, and empirical evidence, to the innovation, design, construction, operation and maintenance of structures, machines, materials, software, devices, systems, processes, and organizations. The discipline of engineering encompasses a broad range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied mathematics, applied science, and types of application. See glossary of engineering. The term engineering is derived from the Latin ingenium, meaning "cleverness" and ingeniare, meaning "to contrive, devise".

ETIM Deutschland e. V. (ElektroTechnisches InformationsModell, or electro-technical information model) is an initiative to standardize the electronic exchange of product data for electrical and electronic products (electrical installation products, home appliances and consumer electronics) to enable the electronic trading of these products. The standard is designed to meet the requirements of the electrical industry and allows for the uniform, technical description of electrical goods and their assignment to a class of products.

Freedom of speech is a principle that supports the freedom of an individual or a community to articulate their opinions and ideas without fear of retaliation, censorship, or legal sanction. The term "freedom of expression" is sometimes used synonymously but includes any act of seeking, receiving, and imparting information or ideas, regardless of the medium used. Freedom of expression is recognized as a human right under article 19 of the Universal Declaration of Human Rights (UDHR) and recognized in international human rights law in the International Covenant on Civil and Political Rights (ICCPR). Article 19 of the UDHR states that "everyone shall have the right to hold opinions without interference" and "everyone shall have the right to freedom of expression; this right shall include freedom to seek, receive and impart information and ideas of all kinds, regardless of frontiers, either orally, in writing or in print, in the form of art, or through any other media of his choice". The version of Article 19 in the ICCPR later amends this by stating that the exercise of these rights carries "special duties and responsibilities" and may "therefore be subject to certain restrictions" when necessary "[f]or respect of the rights or reputation of others" or "[f]or the protection of national security or of public order (order public), or of public health or morals".Freedom of speech and expression, therefore, may not be recognized as being absolute, and common limitations or boundaries to freedom of speech relate to libel, slander, obscenity, pornography, sedition, incitement, fighting words, classified information, copyright violation, trade secrets, food labeling, non-disclosure agreements, the right to privacy, the right to be forgotten, public security, and perjury. Justifications for such include the harm principle, proposed by John Stuart Mill in On Liberty, which suggests that: "the only purpose for which power can be rightfully exercised over any member of a civilized community, against his will, is to prevent harm to others."The idea of the "offense principle" is also used in the justification of speech limitations, describing the restriction on forms of expression deemed offensive to society, considering factors such as extent, duration, motives of the speaker, and ease with which it could be avoided. With the evolution of the digital age, application of the freedom of speech becomes more controversial as new means of communication and restrictions arise, for example the Golden Shield Project, an initiative by Chinese government's Ministry of Public Security that filters potentially unfavourable data from foreign countries.