Gang of Four: Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides. They wrote the seminal patterns book Design Patterns: Elements of Reusable Object-Oriented Software (DP)
Happy Path
Happy Path tests are typically tightly scripted tests of planned system functionality and are a legitimate strategy for some aspects of testing.
In the context of test automation a pattern can be either a description of how some testware has to look like in order to solve some test automation problem or a rule how to perform a particular step in a test automation process or a suggestion how to resolve a management issue. In other words a pattern is expert knowledge proven by repeated experiences.
Pattern language
A pattern language is a collection of patterns that work together to solve some specific problem (of test automation)
System under Test
A session in which a product or piece of equipment is examined under everyday or extreme conditions to evaluate its durability, etc.[1]

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A wiki is a website whose users can add, modify, or delete its content via a web browser using a simplified mark-up language or a rich-text editor. Wikis are powered by wiki software[1].

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The freeencyclopaedia that anyone can edit[1].

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