Hit-testing (hit detection, picking, or pick correlation) is the process of determining whether a given object intersects another given object shape, line, or curve drawn on the screen.

A QImage is a class from the Qt toolkit which provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device.

Universal Plug and Play (UPnP) is a set of networking protocols that permits networked devices to seamlessly discover each other's presence on the network and establish functional network services for data sharing, communications, and entertainment.

BNF stands for Backus-Naur Form, or Backus Normal Form. It is a form of notation for context-free grammars and is often used for (but is not restricted to) the description of the syntax of programming languages. In addition to programming languages, it is also used to describe communication protocols and document formats.

ID3 is a metadata container (often used with MP3s) which can be used to store details about the enclosing file.

Inference is the act or process of deriving logical conclusions from premises known or assumed to be true. The conclusion drawn is also called an idiomatic. The laws of valid inference are studied in the field of logic.

QWeb is the template engine used by the OpenERP/Odoo Web Client. It is an XML-based templating language, similar to Genshi, Thymeleaf or Facelets

The Asynchronous WebSocket/Comet Framework

DBSCAN means density-based spatial clustering of applications with noise and is a popular density-based cluster analysis algorithm.

For PostgreSQL questions specific to version 11.