Abstract Syntax Tree

An abstract syntax tree (AST) is a data structure used in computer science to represent the structure of a program or code snippet. It is a tree representation of the abstract syntactic structure of text (often source code) written in a formal language. Each node of the tree denotes a construct occurring in the text. It is sometimes called just a syntax tree.

Alcoholics Anonymous

Alcoholics Anonymous (AA) is a global peer-led mutual aid fellowship begun in the United States dedicated to abstinence-based recovery from alcoholism through its twelve-step program. AA's twelve traditions, besides stressing anonymity, establish it as non-professional, non-denominational, and apolitical with a public relations policy stressing attraction rather than promotion. In 2020 AA estimated a worldwide membership of over two million, with 75% of those in the US and Canada.

Unified Modeling Language

The unified modelling language (UML) is a general-purpose visual modelling language that is intended to provide a standard way to visualize the design of a system. UML provides a standard notation for many types of diagrams which can be roughly divided into three main groups: behavior diagrams, interaction diagrams, and structure diagrams. The creation of UML was originally motivated by the desire to standardize the disparate notational systems and approaches to software design.