Beta and alpha elements

Wikipedia also has an article about Beta and alpha elements.

The term Beta specifically refers to the stage in a software release life cycle when a project is complete and all of its planned features have been implemented into the product, but it has not yet been finished in the sense that it has not yet left this stage and become a release candidate (or has not yet been released as a demo). A project will usually leave its Beta stage when it has been debugged of most of its glitches, and after operationalizing the features, or making them accessible.

After leaving its Beta stage some of the original features may be removed in final versions of the program, for practical or ethical reasons but it is notable that sometimes such features may still remain in the coding but are inaccessible. Newer features may also be added by the developers, sometimes without the director's acknowledgement as an Easter Egg (a practical joke).

It is named after the Greek letter Beta, as it is the second stage in the software release life cycle. Unlike its previous stage Alpha the developers have tested the software at least once, and all of the intended features have been implemented into the program, although it is rare that certain parts of these features will remain changed in the final product.

In the Pokémon glitch community

The word "Beta" is usually used in the Pokémon (and Pokémon glitch community) to refer to elements which still exist in a Pokémon game, screenshots, illustrations, or concept art which are normally never used (if at all) in the final game or product. This is sometimes used informally however, as elements such as concept art formally should be considered as part of the project in its Pre-Alpha stage.